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Explain why is NH(3) basic while PH(3)is...

Explain why is `NH_(3)` basic while `PH_(3)`is feebly basic in nature.

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Both `overset(* *)NH_(3) " and " overset(* *)PH_(3)` are Lewis bases due to the presence of lone electorn pair on the central atom. However, `NH_(3)` is more basic than `PH_(3)`. The atomic size of nitrogen (Atomic radius = 70 pm) is less than that of phosphorus (Atomic radius=110 pm) As a result, electron density on the nitrogen atom is more than on phosphorus. This means that electron releasing tendency of ammonia is also more and is therefore, a stronger base than phosphine.
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