Discussion
The only metal which forms nitride (M3N) among group(1) elements is :
Answer: C
The metal is lithium, which forms Li3N.
Lithium reacts directly with nitrogen, even at room temperature, to give the ruby-red nitride:
\[ 6\mathrm{Li} + \mathrm{N_{2}} \rightarrow 2\mathrm{Li_{3}N} \]
This is one of the ways lithium resembles magnesium (the diagonal relationship), which also burns in nitrogen to Mg3N2. The very small Li+ ion gives Li3N a high lattice energy, enough to pay for breaking the N≡N bond and forming N3−.
Sodium, potassium and rubidium have larger, less polarizing cations, and their nitrides are not formed this way and are unstable, so the heavier alkali metals do not form M3N on heating in nitrogen.
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