Question

why is N having valency 2 in some chemical formula???​

Answer 1

We know valency is the capacity of an atom to combine with a particular number of atoms of another element. In the case of ammonia, one nitrogen atom combines with 3 hydrogen atoms. ... Therefore, the valency of hydrogen is one. This is how chemical formulae of compounds are formed by swapping the valencies.

Answer 2

. It can have either 3 or 5 valence electrons because it can bond in the outer 2p and 2s orbitals.