Nitrogen Unique Behavior

Anomalous Traits: 

$$\text{Physical State: Diatomic Gas (N}_2\text{ with N}\equiv\text{N)}$$

$$\begin{aligned}\text{Valence Restriction: No Vacant } d\text{-orbitals} \implies \text{Max Covalency} = 4\end{aligned}$$

Concept: Exists natively as a chemically inert diatomic gas bound by a exceptionally strong triple bond, whose chemistry is structurally bounded by a strict maximum covalency limit of four due to the complete absence of energetically accessible $d$-orbitals.

Notation:

• $$\text{Max Covalency}$$ = Maximum number of shared chemical bonds an atom can accommodate.