Question
Why does the reactivity of nitrogen differ from Phosphorus?
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Answer
Nitrogen exists as a diatomic molecule $( N \equiv N )$. Due to the presence of a triple bond between the two $N$ - atoms the bond dissociation energy is large $\left(941.4 kJ mol ^{-1}\right)$. As a result nitrogen is said to be chemically inert in its elemental state. In contrast, P - P single bond is much weaker (213 $kJ mol ^{-1}$ ) than $N \equiv N$ triple bond Therefore, phosphorus is much more reactive than nitrogen.
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