Question

Atomic number of an element is 12. What is its valency?

Answer 1

the valence of an element having Atomic number 12 is 2

Answer 2

Hey, nearest inert gas is Neon (Ne) with atomic no 10
Electronic configuration of atom with atomic no. 12 can be written as,
$ne 3 {s}^{2}$
Ne*

So, its valency will be +2 but it can exhibit +1 also. It is stable in +2 state only.

HOPE THIS HELPS YOU.