Chemistry Question on p -Block Elements

Question

Which among the group-15 elements does NOT exists as tetra atomic molecule?

Answer 1

Solution

Nitrogen due to smaller size, high ionisation energy high electronegativity and the absence of $d$ -orbital does not exist as a tetra atomic molecule

Nitrogen cannot form $d \pi$ - $p \pi$ bond due to absence of $\alpha$ -orbital, so it cannot expand its covalency beyond four as the heavier members of this group can