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The metal that forms nitride by reacting directly with $$\text{N}_2$$ of air, is
Lithium, because of its very small size and the high lattice energy of its nitride, is the only alkali metal that combines directly with nitrogen, $$6\text{Li} + \text{N}_2 \rightarrow 2\text{Li}_3\text{N}$$. The other alkali metals do not form nitrides this way.
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