Why ionic radius of Sb (76pm) and Bi (103pm) less than other elements of the group?

Ionic radius increases on going downwards in any group. In group 15, the last elements Sb and Bi have ionic radii lesser than the rest of its elements. This is because Sb and Bi have completely filled d and f sub-shells which have least shielding effect. Thus they do not guard the valence electrons to a greater extent due to which the valence electrons feel almost whole nuclear charge. This results into attraction of valence electrons towards nucleus and hence size decreases.