Answer:
Nitrogen does not have any \[2d\]
orbitals in its valence shell. Therefore, it cannot extend its covalency upto
five. But incase of phosphorus, vacant \[3d\] orbitals are present. An electron
can be promoted from \[3s\] to \[3d\] orbital. As a result, phosphorus can
extend its covalency upto five and a molecule of \[P{{F}_{5}}\] can exist.
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