Why does the number of elements on the periodic table vary from period to period?

Answer 1

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.

Answer 2

The number of elements in each period of the Periodic Table is based on the number of electron orbitals that can be accommodated within that period. Each period represents a different energy level in an atom, and as you move across the period, the number of electron orbitals increase. This results in the variation in the number of elements from period to period.

Answer 3

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.

Answer 4

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...

Answer 5

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.

Answer 6

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.

Answer 7

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

Answer 8

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

Answer 9

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

Answer 10

why does the number of elements vary from period to period