Question

what is the relationship between the electronic configuration of elements and its valency

Answer 1

Explanation:

The valency of an atom helps in determining whether the atom has lost or gained electrons.

For example, $Ca^{2+}$ ion has valency 2+ it means that the atom has lost two electrons, that is, there is decrease in number of electrons of the calcium ion.

Similarly, $Cl^{-}$ ion has -1 charge it means that the atom has gained one electron. This means there is increase in number of electrons of the chlorine ion.

The electronic configuration of an atom also helps in determining the number of electrons present in each sub-shells.

With the help of electronic configuration we can determine the number of electrons present in outermost shell. Thus, it tells us whether the atom needs to gain or loose electrons.

Depending on the number of electrons, the element will behave as an electronegative or electropositive specie.

Therefore, the relationship between the electronic configuration of elements and its valency is that it helps in knowing whether the element is electron rich or electron deficient.