Question

Why nitrogen nitrogen single bond is weaker than phosphorus phosphorus single bond?

Answer 1

Answer:

N-N sigma bond is weaker than P-P sigma bond due to the small bond length between the nitrogen atoms. The non-bonding electrons(lone pair of electrons) of both the atoms repel each other making it weaker than P-P sigma bond.

Answer 2

Answer:

here it is

Explanation:

N−N single bond is weaker than P−P bond due to smaller size of N as compared to P. Smaller size of N leads to smaller N−N bond length. As a result, the lone pair of electrons on the both the N atoms repel each other leading to unstability or weakening of N−N bond.