Question

What is the relationship between the electronic configuration of an element and its valency

Answer 1

Hi,

Here is your answer

Electronic configuration means the arrangement of electrons in their respective shells including valence shell. The number of electrons in the valence shell determines its valency.
Thus, electronic configuration in a way determines the valency of an element.

For example:
The number of valence electrons in an element is 2, the valency of the element is 2.
The number of valence electrons in an element is 6, the valency of the element is 2.(above 4 valence electrons, the valency is [8 - number of valence electrons]).

Hope this helps you.