Lithium is the hardest alkali metal.

Lithium is the only alkali metal which form nitride directly. Comment.

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

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

Comment on each of the following observations: (a) Lithium is the only alkali metal to form a nitride directly by combination with nitrogen.

Comment on the following observations Lithium is the only alkali metal which forms nitride directly.

List any two points of difference between Lithium and other alkali metals. Give reasons.