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The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements1 Mark
Question
Lithium is the only alkali metal that forms nitride directly on reaction with air. Explain.
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Answer

$\mathrm{Li}^{+}$ion being small in size can easily stabilize small nitride ion $\mathrm{N}^{3-}$, however other alkali metal ions because of their larger size cannot stabilise smaller nitride ion. Thus, only lithium forms nitride.

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