Question

why NCl5 is not known but PCl5 is known?

Answer 1

PCl5 forms by bonding of Phosphorus d-orbital..
while NCl5 don't exist because N don't have vacant d-orbital...

Hope it helps...:-))

Answer 2

Phosphorous has d-orbitals & hence

can accommodate the electrons

from Cl into them,in case of N the

d-orbitals are absent & electrons can be

accommodated only in p-orbitals.Hence

PC15 exists.