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PF(5) is known but NF(5) is not known. D...

`PF_(5)` is known but `NF_(5)` is not known. Discuss.

Text Solution

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Nitrogen does not have any `2d` orbitals in its valence shell. Therefore, it cannot extend its covalency upto five. But in case 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 `PF_(5)` can exist.
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    C
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