The answer can be given on the basis of hybridization for the formation of PCl5 or PH5
P should be sp3d hybridized
One very imp point of hybridization is that energy of orbitals participating in hybridization should be similar.
In case of PCl5 since Cl more electronegative than P so because of 5 Cl atoms P gets high Positive charge because of this, orbitals come closer to each other and energy becomes similar? while in case of PH5 it doesn?t happen so orbitals don?t get hybridized and PH5 does not form.
Moderation Team
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