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NF(3) is not hydrolysed while NCl(3) can...

`NF_(3)` is not hydrolysed while `NCl_(3)` can be readily hydrolysed. Explain.

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Nitrogen does not have vacant 2d-orbitals in its valence shell. Therefore, it cannot extend its covalency beyond three. As a result, the molecule of `NF_(3)` can exist but not that of `NF_(5)`.
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