. How will you find the valency of chlorine, sulphur and magnesium?

Asked by Vishal kumar | 1 year ago |  183

##### Solution :-

The definite combining capacity of the atoms of each element, wherein electrons are lost, gained or shared to make the octet of electrons present in the outermost shell, is defined as valency. To measure valency, we can figure out the number of electrons that are required to complete the shell in which it is contained or losing excess electrons if present, once the filling is complete.

To find the valency of chlorine:

The atomic number of chlorine is 17

The number of electrons is equal to the number of protons in chlorine, i.e., 17

The distribution of electrons in chlorine atom is K - 2, L - 8, M - 7

Hence, from the distribution of chlorine, it is clearly evident that to fill the M shell only one electron is required. Therefore, its valency is -1. i.e, one electron less

To find the valency of sulphur:

The atomic number of sulphur is 16

The number of electrons is equal to the number of protons in sulphur, i.e., 16

The distribution of electrons in sulphur atom is K - 2, L - 8, M - 6

Hence, from the distribution of sulphur it is clearly evident that to fill the M shell, two more electrons are required. Therefore, its valency is -2, i.e., two electrons lesser.

To find the valency of magnesium:

The atomic number of magnesium is 12

The number of electrons is equal to the number of protons in magnesium, i.e., 12

The distribution of electrons in magnesium atom is K - 2, L - 8, M - 2

Hence, from the distribution of magnesium, it is clearly evident that to fill the M shell six more electrons are required. But M shell has two electrons only. It possesses lesser electrons than needed to fill the shell. Thus, we say that the magnesium atom is not stable as the M shell has 2 electrons. Its valency is +2, meaning it has 2 electrons in excess.

Answered by Shivani Kumari | 1 year ago

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