Answer to Question #53710 in Inorganic Chemistry for manisha
The first one is the large radius for I, which doesn’t allow to place five Iodine around phosphorus at proper distances. At the same time, as iodine is in the bottom of the group, the stability of P-I bonds are lower than for P-Cl. This is also conditioned by its large radius, which can’t promote the sufficient stabilization of bonding electrons upon bond formation.
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