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Which among the following alkali metals readily reacts with Nitrogen and form stable nitride?

Option: 1

Li


Option: 2

Na


Option: 3

K


Option: 4

Both 1 and 2


Answers (1)

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Lithium is the only alkali metal which readily reacts with nitrogen at room temperature due to its small size and high polarising power. The lithium nitride is stable. 

\mathrm{6Li+N_{2}\rightarrow 2\; Li_{3}N}

Other alkali metals when reacted with nitrogen would not release enough lattice energy and therefore, the reaction would be endothermic. Even if the reaction occurs, the nitrides are unstable.

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