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 PF5 exist but NF5 does not exist .why?

 @Nikhil,

Well answered! Keep it up!

Nitrogen and phosphorus both have 5 electrons in their outermost shell. So they need 3 electron to complete their octet. So NF3 and PF3 exist and both nitrogen and phosphorus show the covalency of 3. 

But Nitrogen does not have vacant d orbitals but phosphorus has empty 3d orbital. So it can accept more electrons and can increase its covalency to 5 to make PF5. 

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Phosphorous has an empty d-orbital while N does not. The electrons transfer to the empty d orbital and thus P can show covalency 5, while in case of  N there is no d orbital so the maximum covalency of N  remains 3. Electrons in N does not have any empty orbital to get transferred.

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