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Nitrogen has reasonable oxidation number in all of the following compound and yet one of them not stable which one and why?(1)NF3(2)NF5(3)HNO3(4)NO3(5)N2O5



Nitrogen cannot form pentahalides because it cannot expand its octet due to the non-availability of d-orbitals.
Nitrogen has only two shells (n=2), thus it has s and p orbitals only. Due to this reason nitrogen cannot expand its covalence beyond four(because of absence of d-orbitals), thus it does not form pentahalide.
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