convalent and ionic (in a particular state )radii increase in size down that group. Only a small increase in covalent radius is observed as one moves from

Options

A. `N` to`P`
B. `P` to`As`
C. `As` to`Sb`
D. `Sb` to`Bi`

Answer

4

Explanation

There is a considerable increase in covalent radius from `N`to `P` (`70` pm to `110`pm).However ,from `Sb`to `Bi`only a small increase in covalent radius is observed (`141`pm to `148`pm.) This is due to the presence of completely filled `d` and `f` subshells in `Bi`