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Though nitrogen exhibit +5 oxidiation st...

Though nitrogen exhibit +5 oxidiation state, it does not form pentahalide. Why?

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Nitrogen `(Z=7)` has configuration of `1s^(2), 2s^(2),2s^(2),2p^(3)`. The valence shell in nitrogen `(n=2)` does not contains d - orbitals. As a results of this nitrogen cannot expand its convalence beyond three. Accordingly, it cannot form pentahalide.
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