Pcl5 is known but Ncl5 is unknown why
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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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Phosphorous has d-orbitals & hence
can accommodate the electrons
from Cl into them,in case of N the
d-orbitals are absent & electrons can be
accommodated only in p-orbitals.Hence
PC15 exists.
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