Question

A single bond between two nitrogen atoms is weaker than two phosphorus atoms why

Answer 1

phosphorus-phosphorus triple bonds are much weaker than Nitrogen-nitrogen triple bonds, for the same reason that S=S double bonds are weaker than O=O double bonds phosphorus atoms are too big to come close enough together to form strong bonds. So nitrogen atoms is weaker than two phosphorus atoms

Answer 2

As a result, phosphorus-phosphorus triple bonds are much weaker than Nitrogen-nitrogen triple bonds, for the same that S=S double bonds are weaker than O=O double bonds Phosphorus atoms are too big to come close enough together to form strong bonds.