Question

The electronic configuration of an atom of element X is 2,8,2 what will be the valency of the element x

Answer 1

The element is Magnesium

• It has total 12 electrons

it has electronic configuration

$\\ \sf\longmapsto 2,8,2$

or

$\\ \sf\longmapsto 1s^22s^22p^63s^2$

In valence cell it has 2 electrons and therefore its valency is 2