Question

Maximum co valency of phosphorus can be

Answer 1

Answer:

Nitrogen's maximum covalency is indeed 4. ... This is also the maximum covalency for the nitrogen atom, since it has no more unpaired electrons that could be paired up with other atoms, to form more covalent bonds

Answer 2

Recall that covalency is the number of shared electron pairs formed by an atom of that element. Nitrogen's maximum covalency is indeed 4. And no, it does not break up its lone pair. Notice that nitrogen's octet is complete as soon it bonds with three H atoms (aka forms ammonia