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Question

Nitrogen does not form pentahalides. Give reason.

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Solution

Nitrogen does not form pentahalides.
The electronic configuration of nitrogen is 1s22s22p3.
It has 5 valence electrons. In the valence shell, it has s and p orbitals. Nitrogen does not has vacant d orbitals. It cannot expand its octet. In other words, it cannot have more than 8 valence electrons. Hence, nitrogen cannot be pentavalent .

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