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The arrangement of chemical elements in the Periodic Table of Mendeleev show the recurrence of the properties of these elements. And this arrangement don't correspond to an equal number of elements in a period; in a period all the elements have the same number of electron shells, and the rule of systematization must be observed.

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12y ago
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11y ago

This is because of how the electrons are packed inside each atom. There are four known electron orbitals, the s, p, d, and f orbitals. Each can hold a different number of electrons: the s can hold 2; the p can hold 6; the d can hold 10; and the f can hold 14.

As you go down the periodic table, different orbitals are filled as you go. On the first period, only the s orbital is filled, so there are only two elements. On the second and third periods, only the s and p orbitals are filled, so there are eight elements each on those. On the fourth and fifth, the s, p, and d orbitals are filled, so there are eighteen elements on those. On the sixth and seventh periods, the s, p, d, and f orbitals are filled, so there are thirty-two elements on those.

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11y ago

elements are divided into those that occur naturally and those that do not. All but two elements with atomic numbers 1 through 92 occur on Earth. Elements with atomic numbers of 93 and higher do not occur naturally. The symbols for these elements are white... Also, elements are classified as metals, nonmetals, and metalloids. In the periodic table, metals are located on the left. Nonmetals are located on the right. And metalloids are in between...

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11y ago

You have to look at the printed date. Some aren't as up to date as others. Also there are a few elements that have not been named or "discovered" yet so some makers do not put them on their tables.

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11y ago

The number of elements per period varies because the period number of a particular element signifies the highest unexcited energy level of an electron for that particular element. This means to a first approximation that as as you move down the periodic table you would observe that the number of the elements increases. This is because there are more sub-levels per the period's level as the energy level of an atom increases.

One good version of the periodic table to check out is one that shows the elements in blocks, s, block, p block, d block, f block. which shows which sub levels are being filled.

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11y ago

One Major reason is that they represent the amount of valence electrons (the outermost electrons of an atom). Another reason is they fit into different families (columns up and down) with similar properties as other elements in the same family

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16y ago

the number of electrons in each orbital increases, so the number of electrons to form a noble gas configuration in ground state increses.

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12y ago

The number of elements per a period varies because the number of available orbitals increases from energy level to energy level

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3y ago

why does the number of elements vary from period to period

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Q: Why does the number of elements on the periodic table vary from period to period?
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Related questions

What does a period on the periodic table tell us?

Elements in the same period has same number of valence shells.There are 7 periods in Periodic Table.


Period number of manganese?

Manganese is in the fourth period of the Periodic Table of Elements. Periods are rows, groups are columns within the Periodic Table of Elements.


How are the elements arranged?

atomic number


Row of elements in the periodic table?

the rows of elements on the preiodic table are called the period. the period tells you the number of electron shells


What row number in the periodic table of elements is neon in?

Period 2.


Which periods have the same number of elements?

Period 4 and period 5 of the periodic table have the same number of elements. There are 18 elements in each period. While some elements in period 4 are calcium, iron, and zinc, elements in period 5 are tin, antimony, and iodine.


What are characteristics of the period table?

The elements in the periodic table are arranged in order of increasing atomic number.


What is the difference3 between a family of elements and elements in the same period?

a family is a column of elements a period is a row of elements


What is a period on the table of elements?

A period is a row of elements on the periodic table.


What does the period number on a periodic table represent?

the Atomic number on Periodic Table is the identity of an element in the table , it gives the indications about Group, period and Block of elements it also predicts the chemical and physical properties of the element.


What similarities do the elements of a particular period on the periodic table have?

The same number of shells


How many elements make up period 6 in the periodic table?

There are 32 elements in the 6th period of the periodic table.