The usual covalency of an atom (except hydrogen covalencyl) is equal to 8-number of the group to which element belongs.

The usual covalency of an atom (except hydrogen covalencyl) is equal to 8-number of the group to which element belongs. This is applicable for non-metals of p -block only. N₂,P,As, Sb all are p -block elements. Among the following, which is most acidic?

(a) NH₃

(b) PH₃

(d) SbH₃

The usual covalency of an atom (except hydrogen covalencyl) is equal to 8-number of the group to which element belongs.

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