What are abnormal behaviour of Nitrogen atom as compared to other family members?

Abnormal Behaviour of Nitrogen:

(1) Nitrogen is a gas, while other elements are solids.

(2) Nitrogen molecule is diatomic (N₂) while molecules of P, As and Sb are tetra atomic (P₄, As₄, Sb₄) and that of Bi is mono atomic.

(3) Halides of nitrogen except NF₃ are highly explosive.

(4) N₂O₃ and N₂O₅ are monomeric while trioxides and pentoxides of P,As and Sb are dimeric.

(5) It is chemically inert due to the presence of triple bond other elements are highly reactive due to presence of single bond in their molecule.
(6) N₂, CO, (CN)¯ are isoelectronic species but N₂ is less reactive due to nonpolar nature and high ionisation energy.

(7) N does not form sulphides

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