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The Wonders of the Periodic Table

Periodic Table

Periodic Table is the tabular arrangement of all the chemical elements which are organized based on atomic numbers, electronic configurations and existing chemical properties.
Periodic Table is the tabular arrangement of all the chemical elements which are organized based on atomic numbers, electronic configurations and existing chemical properties.

Objectives:

Upon completion of this lesson, the students should be able to:

1. list the characteristics of the modern periodic table

2. classify the elements in the periodic table

3. explain the periodicity of elements

explain the periodicity of elements

Johann Wolfgang Dobereiner classified the elements in groups of 3 called triads.
Johann Wolfgang Dobereiner classified the elements in groups of 3 called triads.
John A. Newlands arranged the elements in the order of increasing atomic mass.
John A. Newlands arranged the elements in the order of increasing atomic mass.
Lothar Meyerplotted a graph showing an attempt to group elements according to atomic weight.
Lothar Meyerplotted a graph showing an attempt to group elements according to atomic weight.
Dmitri Mendeleev arranged in the order of increasing atomic weights with a regular repetition (periodicity) of physical and chemical properties.
Dmitri Mendeleev arranged in the order of increasing atomic weights with a regular repetition (periodicity) of physical and chemical properties.
Henry Moseley is known for the Modern Periodic Law.
Henry Moseley is known for the Modern Periodic Law.

Development of Periodic Table

As early as 1800, chemists began to determine the atomic weights of some elements with fair accuracy. Several attempts were made to classify the elements on this basis.

1. Johann Wolfgang Dobereiner (1829)

He classified the elements in groups of 3 called triads, based on similarities in properties and that the atomic mass of the middle member of the triad was approximately the average of the atomic masses of the lightest elements.

2. John A. New Lands (1863)

He arranged the elements in the order of increasing atomic mass. The eight elements starting from a given one is a kind of repetition of the first like the eight notes of the octave of music and called it the law of octaves.

3. Lothar Meyer

He plotted a graph showing an attempt to group elements according to atomic weight.

4. Dmitri Mendeleyeev (1869)

He worked out a Periodic Table of Elements were the elements were arranged in the order of increasing atomic weights with a regular repetition (periodicity) of physical and chemical properties.

5. Henry Moseley (1887)

He arranged the elements in the order of increasing atomic numbers, which relates that the properties of the elements are periodic functions of their atomic numbers. This is known as the Modern Periodic Law.

What are periods, groups and families?

Periods are the 7 horizontal rows in the periodic table

  1. Period 1 has 2 elements corresponding to 2 electrons in the s sublevel.
  2. Periods 2 and 3 have 8 elements corresponding to 8 sublevel electrons in the s and p sublevels.
  3. Periods 4 and 5 have 18 elements corresponding to 18 electrons in the s,p and d sublevels.
  4. Periods 6 and 7 also include the 14 f electrons but the seventh period is incomplete.

Groups are the vertical columns in the periodic table, which are divided into A, and B subgroups. The A subgroups are often called families. Some of the A families are designated by the following:

a. Group IA - Alkali Metals

b. Group IIA - Alkaline Earth Metals

c. Group VIIA - Halogens

d. Group VIIIA - Noble Gases

Other A subgroups are classified according to the first element in the column:

a. Group IIIA - Boron Family

b. Group IVA - Carbon Family

c. Group VA - Nitrogen Family

d. Group VIA - Oxygen Family

Classification of Elements in the Periodic Table

1. Representative Elements are the elements in A Group/ Family. The term representative element is related to stepwise addition of electrons to the s and p sub levels of the atoms. Elements belonging to the same group or family have similar properties.

2. Noble Gases or Inert Gases are the elements in the last group with completely filled set of s and p orbitals.

3. Transition Elements are the elements in the columns IB - VIIIB which are called the B Group/Family. Take note that they start with IIB up to VIIB, which have 3 columns and then end with IB and IIB. These sequences, which contain 10 elements each, are related to the stepwise addition of the 10 electrons to the d sub level of the atoms. These elements are metallic-dense, lustrous, good conductor of heat and electricity and in the most cases are hard. They form the many colored compounds and form polyatomic ions like Mn04 and CrO4.

4. Inner Transition Elements are the 2 additional horizontal rows below composed of 2 groups of elements which were discovered to have similar characteristics as Lanthanum in the 6th period called Lathanoids (Rare Earth Metals) and Actinium (Heavy Rare Elements). The Lanthanoids are all metals while the Actinoids are all radioactive. All the elements after Uranium are produced artificially by nuclear reactions.

The Periodic Table and Electronic Configuration

The ground state electronic configuration of the element is related to their positions in the Modern Periodic Table.
The ground state electronic configuration of the element is related to their positions in the Modern Periodic Table.

The Concept of Valence

Elements within any group exhibit a characteristic valence. The alkali metals of group IA exhibit a valence of +1, since the atoms easily lose the one electron in the outer level. The halogen of Group VIIA has a valence of -1, since one electron is readily taken up. In general, atoms, which have less than 4 valence electron, tend to give up electron thus having a positive valence corresponding to the number of electrons lost. While atoms with more than 4 valence corresponding to the number of electrons gained.

Examples:

12 Mg 1s2 2s2 2p6 3s2

Magnesium will give up its 2 valence electrons forming a +2 valence

8 O 1s2 2s2 2p4

Oxygen has 6 valence electron thus it will gain 2 electrons -2 valence Group VIIIA has a stable outer configuration of electrons (with 8 valence electrons) and would not be expected to give up or take up electrons. Thus, this group has a zero valence.

In the B series, the incomplete level contributes to valence characteristics. One or two electrons from an incomplete inner level may be lost in chemical change and added to one or two electrons in the outer level, which allows possibilities of valence among the transition elements.

Examples:

26 Fe 1s2 2s2 2p6 3s2 3p6 4s2 3d6

Iron may exhibit valence of +2 by loss of the 2 outer electrons or a valence of +3 when additional electron is lost from the incomplete 3rd level.

Lewis Dot System: Kernel Notation and Electron Dot Notation

The kernel notation or electron dot notation is used to show the valence electrons in the atoms. The symbol of the elements is used to represent the nucleus and all inner electrons and dots are used for each of the valence electron.
The kernel notation or electron dot notation is used to show the valence electrons in the atoms. The symbol of the elements is used to represent the nucleus and all inner electrons and dots are used for each of the valence electron.

Metals, Nonmetals and Metalloids

Metals are at the left and in the center of the Periodic Table. About 80 elements are classified as metals including some form in every group except Groups VIIA and VIIIA. The atoms of metals tend to donate electrons.

Nonmetals are at the far right and toward the top of the Periodic Table. They are composed of about a dozen relatively common and important elements with the exception of Hydrogen. Atoms of non-metals tend to accept electrons.

Metalloids or borderline elements are elements that to some extent exhibit both metallic and nonmetallic properties. They usually act as electron donor with metals and electron acceptor with non-metals. These elements lie in the zigzag line in the Periodic Table.

Positions of metals, nonmetals and metalloids in the Periodic Table

Metals, nonmetals and metalloids are neatly arranged in the Periodic Table.
Metals, nonmetals and metalloids are neatly arranged in the Periodic Table.

Trends in the Periodic Table

Atomic Size

The atomic radius is approximately the distance of the outermost region of electron charge density in an atom drops off with increasing distance from the nucleus and approaches zero at a large distance. Therefore, there is no sharply defined boundary to determine the size of an isolated atom. The electron probability distribution is affected by neighboring atoms, hence, the size of an atom may change from one condition to another as in the formation of compounds, under different conditions. The size of the atomic radius is determined on covalently bonded particles of elements as they exist in nature or are in covalently bonded compounds.

Going across any period in the Periodic Table, there is a decrease in the size of the atomic radius. Going from left to right, the valence electron are all in the same energy level or the same general distance from the nucleus and that their nuclear charge increased by one. Nuclear charge is the force of attraction being offered by the nucleus towards electrons. Therefore, the greater the number of protons, the greater is the nuclear charge and the greater is the over pull of the nucleaus on the electron.

Examples:

Consider the atoms of Period 3:

Na 2e 8e 1e Mg 2e 8e 2e Al 2e 8e 3e

Consider the electronic configuration of Group IA elements:

Na 2e 8e 1e

K 2e 8e 8e 1e

Rb 2e 8e 18e 8e 1e

Cs 2e 8e 18e 18e 8e 1e

Fr 2e 8e 18e 18e 18e 8e 1e

Although the number of protons from top to bottom within the same group increases, the atomic size still increases due to the additional energy level as seen from the above illustration. Therefore, atomic size increases from top to bottom within the same group.

Atomic size and Periodic Table

Atoms get smaller from left to right in a period.
Atoms get smaller from left to right in a period.

Ionic Size

When an atom losses or gains electron, it becomes a positively/negatively charge particle called ion.

Examples:

Magnesium losses 2 electrons and becomes Mg+2 ion.

Oxygen gains 2 electrons and becomes 0-2 ion.

The loss of electrons by a metal atom results in a relatively large decrease in size, the radius of the ion formed is smaller than the radius of the atom from which it was formed. For nonmetals, when electrons are gained to form negative ions, there is a rather large increase in the size due to the repulsion of the electrons for one another.

Ionic size and Periodic Table

Cation and anion increase in size as you go down a group in a Periodic Table.
Cation and anion increase in size as you go down a group in a Periodic Table.

Ionization Energy

Ionization energy is the amount of energy required to remove the most loosely bound electron in a gaseous atom or ion to give a positive (+) particle of cation. The first ionization energy of an atom is the amount of energy required to remove the first valence electron from that atom. The second ionization energy of an atom is the amount of energy required to remove the second valence electron from the ion and so forth. The second ionization energy is always higher than the first, since an electron is removed from a positive ion, and the third is likewise higher than the second.

Going across a period, there is an increase in the ionization energy due to the removal of electron in each case is at the same level and there is a greater nuclear charge holding the electron.

Factors affecting the magnitude of the ionization potential:

  • The charge of the atomic nucleus for atoms of similar electronic arrangement. The greater the nuclear charge, the greater the ionization potential.
  • The shielding effect of inner electrons. The greater the shielding effect, the smaller the ionization potential.
  • The atomic radius. As the atomic size decreases in atoms with the same number of energy levels, the ionization potential increases.
  • The extent which the most loosely bound electron penetrates the cloud of inner electrons. The degree of penetration of electrons in a given main energy level decreases in the order of s>p>d>f. All other factors being equal, as in the given atom, it is harder to remove an (s) electron than a (p) electron, a p electron is harder than a (d) electron, and d electron is harder than an (f) electron.

Attractive force between the outer level electrons and the nucleus increases in proportion to the positive charge on the nucleus and decreases with respect to the distance separating the oppositely charged bodies. Outer electrons are not only attracted by the positive nucleus but are also repelled by electrons in the lower energy levels and their own level. This repulsion, which has the net result of reducing the affective nuclear charge, is called the shielding effect or screening effect. Since from top to bottom, ionization energy decreases in A family, the screening effect and distance factors must outweigh the importance of the increased charge of the nucleus.

Ionization Energy and Periodic Table

 Going across a period, there is an increase in the ionization energy due to the removal of electron in each case is at the same level and there is a greater nuclear charge holding the electron.
Going across a period, there is an increase in the ionization energy due to the removal of electron in each case is at the same level and there is a greater nuclear charge holding the electron.

Electron Affinity

Electron affinity is the energy given off when a neutral gaseous atom or ion takes in an electron. Negative ions or anions are formed. Determining electron affinities is a hard task; only those for the most nonmetallic elements have been evaluated. A second electron affinity values would involve gain and not loss of energy. An electron added to a negative ion would result in Coulombic repulsion.

Example:

0 + e- -------------- 0-1 -33 Kcal/mole

0 + e- -------------- 0-2 +189 Kcal/mole

This periodic trends of electron affinity, of the strongest nonmetals, the halogens, are due to their electron configuration, ns2 np5 that lack a p orbital to have stable gas configuration. Nonmetals tend to gain electrons to form negative ions than metals. Group VIIA has the highest electron affinity since only one electron is needed to complete a stable outer configuration of 8 electrons.

Electron Affinity and Periodic Table

Trends in Electron Affinity
Trends in Electron Affinity

Electronegativity

Electronegativity is the tendency of an atom to attract shared electrons to itself when it forms a chemical bond with another atom. Ionization potential and electron affinities are regarded as more or less expressions of electronegativities. Atoms with small size, high ionization potential and high electron affinities would be expected to have high electronegativities Atoms with orbitals nearly filled with electrons will have higher expected electronegativities than atoms with orbitals having few electrons.Non metals have higher electronegativities than metals. Metals are more of electron donors and non metals are electron acceptors. Electronegativity increases from left to right within a period and decreases from top to bottom within a group.

Electronegativity and Periodic Table

Electronegativity increases from left to right within a period and decreases from top to bottom within a group.
Electronegativity increases from left to right within a period and decreases from top to bottom within a group.

Summary of the Trends in the Periodic Table

Video on Periodic Table

Self - Progress Test

hypothetical Periodic Table
hypothetical Periodic Table

A. I. Based on the given IUPAC Periodic Table and hypothetical elements as positioned, answer the following:

1. The most metallic element.

2. The most nonmetallic element.

3. The element with the biggest atomic size.

4. The element/s classified as alkali metal/s.

5. The element/s classified as metalloids.

6. The element/s classified alkali-earth metals.

7. The transition element/s.

8. The element/s classified as halogens.

9. The lightest of the noble gas.

10. Element/s with electronic configuration/s ending in d.

11. Element/s with electronic configuration ending in f.

12. Element/s with two (2) valence electrons.

13. Element/s with six (6) valence electrons.

14. Element/s with eight (8) valence electrons.

15. Element/s with one main energy level.

II. Answer fully the following questions:

1. State the Periodic Law.

2. Explain clearly what is meant by the statement that the maximum possible number of electrons in the outermost energy level is eight.

3. What are transition elements? How do you account for the marked differences in their properties?

B. Copy and fill in the table below:

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122 comments

online4 2 years ago

Oh my god! What a hub? I am fan of this hub. Really a great hub ever seen.


Jessica Chiverton profile image

Jessica Chiverton 2 years ago

I like this hub. Very comprehensive overview of the Periodic Table, history, trends and breakdown of concepts. Nice work!


aziasaaa profile image

aziasaaa 2 years ago from Kuala Lumpur, Malaysia

Wow. This is a great one to read through. Nicely done!


DeGuzmanJCBUHM14 profile image

DeGuzmanJCBUHM14 2 years ago from San Ildefonso, Bulacan

Periodic Table is a chart where elements are arrange acccording to its increasing atomic mass. We should know the use and what are the characteristics of each elements. Element's are very useful to our Industry. We're using these to make our surroundings and to our work. So we should really study elements/ periodic table very well. :)


Jen Angelo Garcia 2 years ago

18Garcia, JA BUHM

The relevance of periodic table to us is to know how it was formed how is it arrange because in Hospitality Management we will handle several things that composes an element it is relavant because it will give us an edge to distinguished non metal to metal . And we can know what possible element we can use to give our job an extra level like liquid nitrogen now use in cooking so periodic table is relevant to us


Casil PIBUHM08 profile image

Casil PIBUHM08 2 years ago

Without periodic table we will not know the components of a certain element. It is relevant in our course because we will learn and know how chemicals will react with one another such as when we are cooking like mixing and using cleaning products.


Mikaela Alavar profile image

Mikaela Alavar 2 years ago from Villa Katrina, Tangos Baliwag Bulacan

1Alavar, MM BUHM

The table is useful for us, modern students and very helpful on our field because it helps predict the types of chemical reactions that are likely for an element. Rather than memorize facts and figures for each element, a quick glance at the table reveals a lot about the reactivity of an element, whether it is likely to conduct electricity, whether it is hard or soft, and many other characteristics.


Villacoba Kaye profile image

Villacoba Kaye 2 years ago

35Villacoba, KH BUHM

Periodic table is a help in every people because it is arrange according to their group whether they are metallic or non-metallic. This is a big help to our course because we are dealing on different chemicals so we must have information about the elements.


Josephdc profile image

Josephdc 2 years ago

Periodic table is very useful in our course because we can see that there are different chemicals that we should know. It can help us in many ways by knowing the different uses of it in our daily lives.

12DelaCruz,JM BUHM


SarmientoMonic profile image

SarmientoMonic 2 years ago from San Miguel, Bulacan

31 Sarmiento, MDC BUHM

Periodic Table is very helpful. As Hospitality Management student, if I prefer to work as a housekeeper, I will encounter different chemicals. With the help of studying the Periodic Table, I will know what group does the chemicals I am using belong.


Kat Canoza profile image

Kat Canoza 2 years ago

04 Canoza, KT BUHM

The relevance of periodic table is to know what element should we mix into a certain element and what not to mix with that element. Also, this will give a background to all types of chemicals we would encounter in the future. An example would be the salt, salt is NaCl or Sodium Chloride; we would know the chemical term for that substance and we would know what is chemical component of that certain element.


Arianne Flores profile image

Arianne Flores 2 years ago

The relevance of periodic table in hospitality management is it keeps us aware in knowing what kind of chemical/element is compatible to another chemical/element that would give satisfaction for a better product.

17 Flores, Arianne BUHM


Klaudine Bianca profile image

Klaudine Bianca 2 years ago

The periodic table of the elements has gone through numerous revisions over the years as scientists have gained more knowledge about the atomic structure of the elements. The most recent version of the periodic table provides useful information that, directly or indirectly, affects everyone. it is important role in forming chemical reactions & other applications like mass spectrometry. With this table we can identify various properties of elements. The influence of the periodic table is not limited to chemistry it also takes part in other subjects like biology, physics, medicine and pharmacology.

2ALCANTARA, KBF BUHM


Nelissa Maon 2 years ago

22 Maon, NP BUHM

As a Hospitality Management Student, periodic table is very helpful to us, because someday we will encounter different kinds of chemicals in housekeeping management, and with the help of studying periodic table, we will know the types of chemicals we will use.


LOUISE JEROME CRU profile image

LOUISE JEROME CRU 2 years ago

9 Cruz, L J, P.BUHM14

For me, as a Hospitality Management Student it is important for us to know the different elements and and we can predict the types of chemical reactions that are likely for an element. We can also know the different materials in the hotels, restaurants, and etc. whether it will react on a particular chemicals and we can use the right chemicals in a particular furniture of fixtures in the hotel, restaurants, and etc. Also in food production it is essential for us to know the different elements that we will put in our foods that we are going to prepare so that the people that will patronize our food will be comfortable because they know that the people prepared it knows the right mixture of different elements.


Miguel Panlilio 2 years ago from Baliuag Bulacan

Panlilio, MAR BUHM

Periodic Table is a very helpful tool for students. we should be aware of elements before we use it. we can use these elements safely if we know what they are. in hospitality industry there are many chemicals and elements used for example cleaning liquids.


Winnie Aquino profile image

Winnie Aquino 2 years ago from San Rafael, Bulacan

Toward the end of 19th century, chemists noted many similarities among elements and tried to group them into certain families with similar properties and reactions. There are over 100 known elements; thus, there are over 100 kinds of atoms each of them has its own place in the periodic table. The periodic table is a summary of the data about an element, this includes name, symbol, atomic number and atomic weight.

Aquino, Winnie

BUHM


Clarisse Silverio profile image

Clarisse Silverio 2 years ago

26 Silverio, AC G. BUHM14

The relevance of periodic table in our course are we can easily know if the chemical we hear or read are chemicals that we can use in cooking and also in cleaning. And also we can determine if it can harm us or not.


DeGuzmanMMBUHM15 profile image

DeGuzmanMMBUHM15 2 years ago

The relevance of periodic table to Hospitality Management is to know different kinds of chemicals because we sure will used this in cleaning and cooking. There are kinds of elements that can harm us if we don't know how to mix it with others. So to prevent it, we need to study elements and chemicals.


Bianca Turingan profile image

Bianca Turingan 2 years ago from Tangos, Baliuag, Bulacan

28 Turingan, BY BUHM 14

The relevance of studying Periodic Table,for us HM student. Is that, we will able to classify and know what would be the use of each element. And it is also related to some of the chemicals we will be using later on,in housekeeping for example, the solvents,liquid we will be using in cleaning.


CruzATBUHM10 profile image

CruzATBUHM10 2 years ago

As a Hospitality Management Student very important to know the people prepared in knows the right mixtures of chemicals because we sure will used this chemicals in cleaning and cooking foods. And we should be aware of chemicals before we used it.


33 Serna, 2 years ago

The importance of the periodic table is that it provides a way of organizing the elements so that it's possible to make certain predictions about their chemical and physical properties based on their position in the table.


33 Serna, AP BUHM 2 years ago

The importance of the periodic table is that it provides a way of organizing the elements so that it's possible to make certain predictions about their chemical and physical properties based on their position in the table.


Nicolit Fernandez profile image

Nicolit Fernandez 2 years ago from Seoul, Korea

14 Fernandez, N.M. A. BUHM14

periodic table is important because it helps us to easily distinguish what kind of elements we are using if it is metal, non metal,or metalloids. In our course BSHM it helps us to categorize or to classify the chemicals that we will use in housekeeping, how it will react and how to use it safely.


PantanJLBUHM 24 months ago

the relevance of periodic table in HOSPITALITY MANAGEMENT is that it may help us and guide us to know what elements or substance we may use in cooking. And what kind of chemicals we can use not harming ourselves.


mchristinelopez profile image

mchristinelopez 24 months ago

21LopezMT BUHM

The relevance of periodic table to Hospitality management is we will know different chemical and the reaction when we mix it. we can apply it for example in cooking.


kimihizatoledo profile image

kimihizatoledo 24 months ago

38 TOLEDO KM BUTM 2014

The periodic table contains the compilation of elements that is very important in our industry as a Tourism student because it can help us to analyze and to determine which is mixtures, the element or other chemicals related to chemistry and this will be help us a lot in our course. Like for example we are serving food on a hotel or to an airline, we should know what is the chemical content of the food if it is safe or not.


Iana Kristine profile image

Iana Kristine 23 months ago

Periodic table is very important in our field. Because as a tourism student we can analyze the proper mixture. Like example in food we serve we should know what subtances the food have. And if its safe to eat.

19LEONI IK BUTM 2014


DelosSantosElaine profile image

DelosSantosElaine 23 months ago from san luis,pampanga

16DelosSantosESBUHM

It is important for us Hospitality Management students to study Periodic Table, since it describes the history, properties, resources, uses, isotopes, forms, costs, and other information for each element, it enable us to apply this following knowledge successfully not only in the field of cooking but also in each chemical we are going to use in cleaning. The different chemical reaction we are going to experience in the future each time we mix them.


Mikaela Nelaine Igaya 23 months ago

18IGAYA MC BUTM

The periodic table is important in tourism industry because it contains the naming of elements. In using periodic table we can analyze and to determine which is mixtures, or other chemicals related to chemistry and this will be help us. For example we are serving food to an airline, we should know if the content of the food that we serve is safe or not.


bernadette devera 23 months ago

Periodic table is important to us, with the help of this ( periodic table ) we can learn the properties of many elements at a time and classification of elements will be easier. Periodic table is also important in our field (tourism management) for example we are working on hotel, we should know what is the chemical content of the food if it is safe to eat or not.

7 DEVERA B. BUTM 2014


Kyla Mae Navarro profile image

Kyla Mae Navarro 23 months ago

24 NAVARRO, KDG BUTM 2014

Periodic table describes every single known element. The chemical substances that separately or combined, make up everything we can see or sense around us. We eat and breathe the periodic table. Not knowing the different elements can harm and poison us. That's why in the field of tourism it is important for us to study the periodic table of elements for us to do and serve safely our passengers.


Rollyne Munsayac profile image

Rollyne Munsayac 23 months ago

23 MUNSAYAC RE, BUTM 2014

The periodic table is the most important chemistry reference there is. It arranges all the known elements in an informative array. With the help of the periodic table, we can analyze the proper mixture we should use for the safety of the passengers.


mchristinelopez profile image

mchristinelopez 23 months ago

21 LOPEZMT, BUHM

The importance of periodic table is organizes elements according to similar properties so you can tell the characteristics of an element just by looking at its position on the table.The table is useful for modern students because it helps predict the types of chemical reactions that are likely for an element.


Castro F C BUTM profile image

Castro F C BUTM 23 months ago

7 CASTRO F C BUTM 2014 Periodic Table is usually important in our field cause we can help us to determine the differences of chemical mixture etc. and it may help us because it contains naming the elements. And we may apply the knowledge in our working career.


Arel Zcirem 23 months ago

8 CANIMO AZ B BUHM 2014

The relevance of studying Periodic Table,for us HM student. Is that, we will able to classify and know what would be the use of each element.

We should know the use and what are the characteristics of each elements.


Dindin Rivera profile image

Dindin Rivera 23 months ago from Baliuag, Bulacan

RIVERA DINDIN

BSTM-IV

The importance of the periodic table is that it provides a way of organizing the elements so that it's possible to make certain predictions about their chemical and physical properties based on their position in the table.


reginajsangabriel profile image

reginajsangabriel 23 months ago from baliuag,bulacan

34 SAN GABRIEL, RJ BUTM 2014

The periodic table of the elements describes the atomic structure of all elements that are known to mankind. For instance, by looking at the periodic table, a person can find out how many electrons the element has and how much it weighs. Each element has its own separate set of such data; no two elements are the same. Thus, if someone is uncertain what matter he has, he can look at the atomic structure of the material, compare it to the information in the periodic table, and identify the material by matching it to the element on the table with the same data.


James Leoni III profile image

James Leoni III 23 months ago from Candaba, Pampanga

20Leoni J BUHM

The importance of the periodic table in our course is must beccuase without it we can't find what element to use on our certain jobs.


Daphne Santiago profile image

Daphne Santiago 23 months ago from Bulacan

29SantiagoMMBUHM

The importance of The Periodic Table in Hospitality Management.It can help us to know different chemicals, metals etc. that we use in cooking and cleaning.


DelaCruzMFBUHM13 profile image

DelaCruzMFBUHM13 23 months ago

13DelaCruzMFBUHM

The periodic table of the elements describes the atomic structure of all elements that are known to mankind. For instance, by looking at the periodic table, a person can find out how many electrons the element has and how much it weighs.


DelaCruzMFBUHM13 profile image

DelaCruzMFBUHM13 23 months ago

13DelaCruzMFBUHM

The periodic table is the most important chemistry reference there is. It arranges all the known elements in an informative array.


Heidi Valerio profile image

Heidi Valerio 23 months ago

VALERIO, HEIDI MAE L. BUHM

The importance of the Periodic table in Hospitality Management. It can helps us to identify or to know what are the chemicals that we can use in cooking or in any kinds of things that involve in our course.


35 SAN PEDRO PM, BUTM 2014 23 months ago

Having a periodic table is important because it teaches us a lot of information about different elements. The periodic table is a chart where we will find the different atomic mass, atomic number, and a lot of different properties of an element. A Periodic table helps us know how to solve problems including the elements. It is a very helpful table.


KadowakiTBUHM profile image

KadowakiTBUHM 23 months ago

21 Kadowaki T BUHM 14

The importance of the Periodic Table in HM is we can easily know and identify the different element. We know about chemical reaction and physical and chemical change of one activity we going to do.


Bhel Marie profile image

Bhel Marie 23 months ago

MENDOZA, BHEL MARIE N. BUHM1-1

The periodic table is so important to me because it helps me to identify what are the chemicals and to know how to use it in my course. Thank you ma'am .


Chlaryse Tesaluna profile image

Chlaryse Tesaluna 23 months ago

37 TESALUNA C BUTM 2014

Periodic Table is important for us especially for those scientist who make some experiments. It is important because it is needed to know what kind of elements will you use in an experiment. Each kind of elements in periodic table have functions. And it gives us more knowledge about chemistry.


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jeaniejeanjean 23 months ago from Malolos,Bulacan

26 ORTIZ JA BUBSPSY 2014

Studying periodic table is important for my course in a way of it can help me identifies some common and uncommon elements existing and can be used for some medicine and of course elements that can affect human beneficial or not.


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Cha Dela Pena 23 months ago from Pulilan, Bulacan

DELA PEÑA,CHARISH BUHM

The importance of periodic table to us, It help us to know all the chemicals that we needed to apply in cooking and also in cleaning.

It is important because those elements are useful when we put in our foods that we will serve to our guest. so when we know the elements also the chemicals, our guest will satisfied to our service.


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Ivory Salonga 23 months ago from San Ildefonso, Bulacan

32 salonga IS BSTM 2014

Periodic table is very important in chemistry and also in my industry which is tourism industry because like when we are mixing foods and put a salt or a sugar it can taste good,i can know the chemicals And i can know the amount of salt and the important of it. Otherwise, the metal when we our on the airplane we can know if that is metal or metallic.


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Agnes Sato 23 months ago from Baliuag, Bulacan

36 SATO MA BSTM

The periodic table of elements is important in my field, tourism management because there are meanings in each letters. And there are some mixing food and beverages in our field. There is also mettalic and non-metallic. Etc.


Nicko Sanguyo 23 months ago

28 NS BUHM

Why we study the periodic table? It is bec. As a hm student we use any chemicals and that chemicals have an element. It is easy to us to classify what is that chemical are used for.


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yuriannesantos 23 months ago

35 Santos YA BUTM 2014

Periodic table is used to learn about the elements; and in our course we are dealing with many kinds.of elements like in foods, metals used in airplanes,buses,and many kinds of transportation so we need to know many informations about the elements.


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Julien Villanueva 23 months ago

Villanueva, Julien / BUHM 2014-2015

I don't get to use the periodic table a lot. But I still think that this is important. A lot of great people spend their lives making and revising the periodic table for us to gain knowledge about what they have discovered. Just imagine all of those elements. All of the details that we need to know about a certain element is in the periodic table. Imagine how much time and research they did for us to get all of the information we have right now. Periodic table is the fruit of their hard works. Periodic table is important.


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Joanna Mari 23 months ago

35 VERGEL DE DIOS, JMDC BUHM14

In modern times, we have tripled our use of the elements, but we still fail to recognize their importance to our lives. The periodic table is our number one source of information on the elements, but it does little to highlight the elements all around us. Some information is inferred from looking at it in a certain way. But these properties can be abstract and difficult to understand.


RuelGiray 23 months ago

13 Giray Ruel -BUTM 2014-2015

The periodic table is useful for modern students and scientists because it helps predict the types of chemical reactions that are likely for an element.


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Jonna Mae Book 23 months ago

04 BOOK, JM BUTM 2014

The importance of the periodic table is to know the atomic numbers, atomic mass, the valence, the electronegativity, and many more. Also to know the right chemical names. This is like a guide for us, some can memorize the periodic table but they prefer not to make it harder for some people so they create this in order not to be difficult. That's why this helps a lot.


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Clarenz Maximo 23 months ago

21 MAXIMO CR BUTM 2014

The importance of the periodic table is that it provides information about elements. We can easily know what element is it. Our field is dealing in many kinds of elements like foods and metal used in transportation so we really need to know many information about the elements.


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Pie Capistrano 23 months ago

Periodic table of elements is important because it makes life easier. Instead of memorizing facts and figures for each element, a quick glance at the table reveals a lot about the reactivity of an element, whether it is likely to conduct electricity, whether it is hard or soft, and many other characteristics.


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Elli Rose Gabriel 23 months ago

We should know what are the periodic table's content and how it may affect the things that we are using to, specially as a Tourism student we're dealing with so many people. We should know what we're putting or using on preparing foods so it may not harm others.


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Elli Rose Gabriel 23 months ago

1 BALELA, E.G BUTM 2014

We should know what are the periodic table's content and how it may affect the things that we are using to, specially as a Tourism student we're dealing with so many people. We should know what we're putting or using on preparing foods so it may not harm others.


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Carla Katrina 23 months ago from Baliwag, Bulacan

LIWAG, CK BUHM 2014

Periodic table are important to HM students, because we use some elements when cooking, like aluminum for cans and foils, kitchen utensils. When we are cleaning, we should know what was the chemicals we need. Knowledge of this is useful for us.


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Estacio M O BUTM 23 months ago

Estacio, M O BUTM - IRREG

It is important specially in Tourism Industry because before you serve the food, you have to apply some ingredients that will make the food taste good.


john carl ballentes 23 months ago

B A L L E N T E S, john B U H M 2014 2015

periodic table are important to HM student,because in cooking we need to know what are the chemical that we use


Leah Mae Perez profile image

Leah Mae Perez 23 months ago

20 PEREZ, LME BUHM14

As a HM student is very helpful to us because the periodic table will be the basic and to understand on how those elements reacts with each other to form compound. To be able to know the components of each elements and to differentiate the composition. It is also serve as a guide lines on how we can create on can make a proper mixture of elements.


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Melanie Samson 23 months ago

31 SAMSON, MH BUTM1-12014-2015

Since the day I started my high-school year, Chemistry introduces me the periodic table and as I go through General Chemistry today, I supposed to study Periodic Table again and be able to know and learn the elements' properties and responsibilities.


Reniel Carillo 22 months ago

periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties.

CARILLO,RENIEL M. BUHM 2014-2015


Johnmarverickr 22 months ago

REYES, MARVERICK BUHM 2014-2015

The significance of Periodic table in hospitality management is that the periodic table we use today is based on the one devised and published by Dmitri Mendeleev in 1869.Mendeleev realized that the table in front of him lay at the very heart of chemistry. And more than that, Mendeleev saw that his table was incomplete - there were spaces where elements should be, but no-one had discovered them.


HoneyGrace Salonga 22 months ago

21 SALONGA HGC. BUHM14

The importance of periodic Table is in we will classify it, if it is Metal,Non-Metal or Metalloids which is very important. we our living or sorrounded with different elements, that's why it gives as an idea when it is dangerous or not.


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Joshua Lim Calma 22 months ago from San Miguel Bulacan

CALMA JOSHUA

The importance of periodic table to classified the kind of elements and they group and they uses.


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Joshua Lim Calma 22 months ago from San Miguel Bulacan

CALMA JOSHUA

Periodic Table is 1 of most important because periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number


27 PARUNGAO GT BUTM 2015 22 months ago

The periodic table is the most important chemistry reference there is. It arranges all the known elements in an informative array. People also gain information from the periodic table by looking at how it is put together. By examining an elements position on the periodic table, one can infer the electron configuration.


Steven baylon 22 months ago

a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.


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johncarl ballents 22 months ago from San Rafael, Bulacan

Periodic table is important in hm. Because periodic Is Arrangement Of The Chemical Elements or the Basis Of Their Atomic Number.


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Carl patrick tan 22 months ago

33 TAN BUHM

Being a Hospitality Student, it is important fro us to know how significant the periodic table in our course. As I have my own idea, for me, it is really important for us because we should know the components of every equipment and materials we are going to use. Periodic table is used to learn about the elements; and in our course we are dealing with many kinds.


johnrenz santos 21 months ago

24 SANTOS JRA BSHM14

periodic table is the most important thing in the field of science.


Brilliant Joshua Dela Cruz 21 months ago

periodic table is the most important in science.


Brilliant Joshua Dela Cruz 21 months ago

periodic table is the most important in science.


Cea Castillo profile image

Cea Castillo 21 months ago

The periodic table is useful for modern students and scientists because it helps predict the types of chemical reactions that are likely for an element. Rather than memorize facts and figures for each element, a quick glance at the table reveals a lot thing that you need.


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AndreaBarcita 21 months ago

3 BARCITA AR M. BUHM14

The relevance of periodic table in our course is when we are cooking we check the ingredient if it is a liquid gas or solid. Like in periodic table we check if its metal, metalloids or non metals and the different elements of this. It is important for us to know because if we don’t know, we might change something to that chemical or food.


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gelo hernandez 21 months ago

Hernandez Angelo BSHM

Periodic table is important because of it we will know the kinds of all metals, nonmetals and metalloids and also we can determine if it can harm us or not.


AndreaBarcita profile image

AndreaBarcita 21 months ago

3 BARCITA AR M. BUHM14

The relevance of periodic table in our course is when we are cooking we check the ingredient if it is a liquid gas or solid. like in periodic table we check if its metal, metalloids or non metals and the different elements of this. It is important for us to know because if we don’t know, we might change something to that chemical or food


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AlmiraEvangelista 21 months ago

Evangelista, Almira

BSTM l-l

When I first saw the periodic table, I had learn to use the periodic table at the hard way. I wasn’t sure how much it would help me, but when i started learning it, it made me realized that the elements in periodic table have much important in my field.


kennethCorpuz 21 months ago

periodic table is a powerful and connect of the course because tourism management is needed of symbol nunber and names of periodic like carbon and oxygen is important of animals and palnts. about scientist is learn of cholesterol from animals and plants is phytosterol..


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Cess Capulong 21 months ago

It's a must to be able to understand and how, especially, use the periodic table. To specify the kind of elements. I remember when I was in high school the first element I learn is the Ca which is Calcium, well as for the other lessons periodic table is really useful for example: How to seek the atomic orbitals and such In total, things that we use, eat and see are things which involves the elements in the periodic table.


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Patricia Rivera 21 months ago

In our case Periodic Table was really not my type in chemistry because it has many to study with, to be honest. But I really understand how to use it and the importance of it. In tourism management it can also be applied to my course and it helped me also by knowing the elements of it.


Krisette Enriquez profile image

Krisette Enriquez 21 months ago from Plaridel, Bulacan

13 ENRIQUEZ, KC BUTM 2014

We, Tourism students, also need to learn about the Periodic table. It is helpful to identify a particular substance once we already know something about a certain element.


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Richmond V 21 months ago from Bustos, Bulacan

The periodic table is very important for students because it can help us on learning the basic characteristics of an element and the reactions it can create with other elements.


Rolyn Santos profile image

Rolyn Santos 21 months ago from Bustos, Bulacan

The periodic table is the most important chemistry reference there is. It arranges all the known elements is an inforamtive array. elements are arranged left to right and top to bottom is order of increasing atomis number. Order generally coincides with increasing atomic mass.


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renzocauzon 21 months ago

09 Cauzon,RA BUHM

The periodic table is the most important chemistry reference there is. The periodic table is useful for modern students and scientists because it helps predict the types of chemical reactions that are likely for an element.


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simplyariannejoy 21 months ago

17 Flores, AJ BUHM

The relevance of periodic table in hospitality management is it keeps us aware in knowing what kind of chemical/element is compatible to another chemical/element that would give satisfaction for a better product.


Eimon Paolo 21 months ago

Periodic table is very important because it is our guide in chemistry.


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Ellen Canoza 21 months ago from Bonga Mayor, Bustos Bulacan

03, Canoza EM BUHM

The relevance of Periodic Table in Hm students is a big scope for us,It's human nature to organize things. Cooks painstakingly organize their spices into various groupings, whether alphabetically or according to how often they're used. Kids dump out their piggy banks and sort their riches into piles of pe­nnies, nickels, dimes and quarters. Even the items in a grocery store are grouped a certain way.


John Carlo Viola 21 months ago

The relevance of the periodic table to HM students, it may help us and guide us to know what elements or substance we may use in cooking


Glenric Samaniego profile image

Glenric Samaniego 21 months ago

This helps us understand and know the true nature of elements that we use everyday. Many of us does not know that we use elements as part of our daily living.


John Andrew Cabrera 21 months ago

The periodic table is useful for modern students and scientists because it helps predict the types of chemical reactions that are likely for an element.


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Trisha Vanguardia 21 months ago from San Ildefonso,Bulacan

For HM student it is very important to know the elements and components of periodic table so that we can understand what use of that element and substance.


john angelo s. ortega bshm2 21 months ago

as an hm student, it was very much important to know because in my industry, i need to know the different properties and substances of the chemicals we are using in cleaning specific part of the hotel . also as a cook, i need to know the different chemicals used in preparing or in making specific ingredients to make food.


Steph San profile image

Steph San 21 months ago

30SANTIAGO S, BUHM

The periodic table of the elements has gone through numerous revisions over the years as scientists have gained more knowledge about the atomic structure of the elements. And periodic table help us to know what are the difference between all those element and it help us when preparing food because it teach us the differences between chemicals


19 Garcia R. BUHM 21 months ago

A periodic tables are important to as because they can help to us to see all of the chemical symbol,mass,units etc. Being a HM students it is very important to know the elements and components of periodic tables.


MarjorieLansanganBSHM 21 months ago

The relevance of periodic table to us is to know how it was formed how is it arrange because in Hospitality Management we will handle several things that composes an element it is relevant because it will give us an edge to distinguished non metal to metal


Marife DG. Montejo 21 months ago

The importance of studying and learning about the different elements in periodic table for us is to identify what elements is being used to create a certain thing. And what element is present on the thing we may used in the future to our job.


Mary Rose Banzon 21 months ago

Being a TM student and an gen. chemistry student of prof liway the periodic table is important. even in high school our teacher is assigning us to memorized the periodic table and right now i think it is helpful in my subject.


Mary Rose Banzon 21 months ago

Periodic table was a main view in chemistry. When i was high school my teacher assigned us to memorized periodic table and now it is useful in my industry because of my gen. chemistry subject.


Janice Gonzales 21 months ago

GONZALES JB BUTM

The important of periodic table is useful for modern students and scientists because it helps predict the types of chemical reactions that are likely for an element.


MARCELO JME BUTM 21 months ago

The periodic table is the most important chemistry reference there is. It arranges all the known elements in an informative array. Elements are arranged left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass.


Zyrine Mae Taruc 21 months ago

Taruc, ZD, BUTM 2014

Production of elements having higher atomic numbers is being pursued, with the question of how the periodic table may need to be modified to accommodate any such additions being a matter of ongoing debate.


28quizon,CA 21 months ago

as a tourism student it is very important to know the elements and components of periodic table so that we can understand what use of that element and substance.


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jairafulgencio 21 months ago

FULGENCIO JM BUTM 2014

It is important fro us to know how significant the periodic table in our course. As I have my own idea, for me, it is really important for us because we should know the components of every equipment and materials we are going to use


Rad Mesina profile image

Rad Mesina 21 months ago from Calumpit, Bulacan

23 MESINA, DJ BUHM

The table is useful for modern students like us because it helps predict the types of chemical reactions that are likely for an element. Rather than memorize facts and figures for each element, a quick glance at the table reveals a lot about the reactivity of an element, whether it is likely to conduct electricity, whether it is hard or soft, and many other characteristics.


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Jole Ymenel Tila 21 months ago from Pulilan, Bulacan

Tila Jole Ymenel F. BUHM

The relevance of periodic table in Hospitality Management is it keeps us aware in knowing what kind of chemical element is compatible to another chemical element that would give satisfaction for a better product.


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Paulo Tomas 21 months ago

TOMAS J P BUHM

A periodic table can help us to see all of the chemical symbol, mass, units etc. It can help us to study the chemical in easy way and it like a complete package you can see the definition of a specific chemical


Angelica Salinas profile image

Angelica Salinas 13 months ago

Angelica G. Salinas BSBA 1-1 - The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The table also shows four rectangular blocks: s-, p- d- and f-block. In general, within one row (period) the elements are metals on the lefthand side, and non-metals on the righthand side. The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. Dmitri Ivanovich Mendeleev was the one who formulated the Periodic Law, created his own version of the periodic table of elements, and used it to correct the properties of some already discovered elements and also to predict the properties of eight elements yet to be discovered.


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Genie de Ocera 12 months ago from San Miguel, Bulacan

Genierose de Ocera

BSA I-4

The periodic table of the elements has gone through numerous revisions over the years as scientists have gained more knowledge about the atomic structure of the elements. The most recent version of the periodic table provides useful information that, directly or indirectly, affects everyone.The periodic table is one of the most significant achievements in science, capturing the essence not only of chemistry but also of physics and biology. It is a unique tool, enabling scientists to predict the appearance and properties of matter on Earth and in the rest of the Universe. It gives a systematic account of the early developments that led to the classification of the elements. As an accountancy student who is taking up Science subjects, the table is useful for us including the scientists because it helps predict the types of chemical reactions that are likely for an element. Rather than memorize facts and figures for each element, a quick glance at the table reveals a lot about the re activity of an element, whether it is likely to conduct electricity, whether it is hard or soft, and many other characteristics.


Rolaine Ingalla profile image

Rolaine Ingalla 12 months ago

A periodic table, a listing of chemical elements arranged according to their properties, can be similar to a chart of accounts, a listing of all accounts that are accompanied by their reference number, which can help the users to easy locate a specific element or an account title. Having enough knowledge on how the elements are located to their respective position now and how it will immediately locate can help us to be time efficient and, therefore, more works to finish and more pay in return.


Rolaine Ingalla profile image

Rolaine Ingalla 12 months ago

BSA 1-3 Ingalla, Rolaine Ann B.


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kimberlymagtalas 12 months ago

Kimberly Anne DC. Magtalas BSA 1-3

The periodic table of elements is important in science because everything is made up of elements. The periodic table is organized according to trends in element properties. The periodic table provides all the information you need to balance chemical reactions at a glance. It helps us predict the types of chemical reactions that are likely for an element. We can learn the properties of many elements at a time and classification of elements will be easier.


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ismaellozano123 11 months ago from Baliuag Bulacan Philippines

Lozano, John Ismael E. (BSA 1-2)

For me periodic table is the list of all elements. Its is important because our body, everything, the world is made up of element. It has all the information of elements that needed on studies. It will be good if we all know each element in the periodic table


Mary joy Anoche BSA 1-2 11 months ago

periodic table is not about presenting the name of the element, it show the atomic no or what that element consist, and there is an division with it. periodic table is important to us to learn what element is needed in chemical like the water its consist of two hydrogen and an oxygen.


Nixie Miranda BAC II 4 days ago

Periodic table is the most important chemistry reference. It arranges all the known elements in an informative array. Elements are arranged left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The Periodic Law states that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number.


Chella Maniquiz, BSTM 7:30-12:00 2 days ago

The periodic table is the most useful tool in chemistry. The periodic table was used to predict all the element on the table. It helps us know its atomic number and its atomic weight. Periodic table is also useful in our course Tourism or in Hospitality Management because it keep us to be aware in knowing what kind of elements when we prefer to work as a housekeeper in the future.


Karen Manalac, BAC IV 7:30-12:00 27 hours ago

The periodic table of elements is a tool that can be useful in such ways. Present in a periodic table of elements are the elements that are discovered and that exist in this world. It is important to be familiarize with that so that when there comes a time when you kind of encounter some elements, you may know a little bit of a background to that particular element. It it significant to our course due to the fact that we, researchers need to always dig on information that will be given to the people.

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