Question

In group 15,why is only nitrogen can't able to extend its coordination number
beyond 4?

Answer 1

In group 15 Nitrogen is the only element which does not have vacant d-orbitals.
While all others can use these vacant d-orbitals for expanding their octet and for bonding, nitrogen cannot.
So, nitrogen can only use its one s and three p orbitals for bonding, exhibiting maximum covalency of 4.

Answer 2

Answer:

In group 15 Nitrogen is the only element which does not have vacant d-orbitals.

While all others can use these vacant d-orbitals for expanding their octet and for bonding, nitrogen cannot.

So, nitrogen can only use its one s and three p orbitals for bonding, exhibiting maximum covalency of

Explanation: