Question

Comment on each of the following observations:
Lithium is the only alkali metal to form a nitride directly.
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Answer 1

Lithium is the only alkali metal to form a nitride directly. This is because of the following reasons:

⇒ Li+ is very small in size and so its size is the most compatible with the N3– ion.

⇒ One more reason is that because of the diagonal relationship of Li and Mg. Lithium like magnesium forms a nitride while other alkali metals do not.

6Li (s) + N2 (g) 2Li3N (s)

Answer 2

Explanation:

Lithium is the only alkali metal to form a nitride directly.

because of the products formed a stark