Question

Why nitrogen cannot show valency 5 like phosphorus?

Answer 1

The conventional answer is the “expanded octet because d-orbitals” explanation. The reason that phosphorus can form “five bonds” and nitrogen only three or four has to do with the size of the two atoms. Phosphorus can fit five fluorine atoms around itself; nitrogen cannot.

Answer 2

it is because it does not have any d orbital electrons to form pentavalent species .

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