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nitrogen cannot form penta halides give reason
Nitrogen is a 2nd period element and its a chemical sin to put more than 8 valence electrons around nitrogen as there are only four orbitals (s.p.p.p) available in the 2nd energy level.
Excitation to 3 level is "impossible". The inner core of 1s can not be disturbed. Pentahalides would essentially put 10 electrons around N and hence not possible.


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