In case of nitrogen,  ${\mathrm{NCl}}_3$  is possible but not  ${\mathrm{NCl}}_5$  while in case of phosphorus,  ${\mathrm{PCl}}_3$  as well as  ${\mathrm{PCl}}_5$  are possible. It is due to

Availability of vacant $\mathrm{d}-$orbitals in $\mathrm{P}$ but not in $\mathrm{N}$

Occurrence of $\mathrm{P}$in solid while $\mathrm{N}$ in gaseous states at room temperature

Lower electronegativity of $\mathrm{P}$and $\mathrm{N}$

Lower tendency of $\mathrm{H}-\mathrm{bond}$ formation in $\mathrm{P}$ than $\mathrm{N}$