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Chemistry 18 Online
OpenStudy (anonymous):

PCl5 exist but NCl5 not. why?

OpenStudy (anonymous):

PCl5 forms five bonds by using the d-orbitals to "expand the octet" and have more "places" to put bonding pairs of electrons. NCl5 does not exist because there are no d-orbitals in the second energy level. Therefore there is no way to arrange five pairs of bonding electrons around a nitrogen atom.

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