Ionic radii (in `Ã…`) of `As^(3+), Sb^(`(3+)` and `Bi^(3+)` follow the order

Options

A. `As^(3+) gt Sb^(3+) gt Bi^(3+)`
B. `Sb^(3+) gt Bi^(3+) gt As^(3+)`
C. `Bi^(3+) gt As^(3+) gt Sb^(3+)`
D. `Bi^(3+) gt Sb^(3+) gt As^(3+)`

Answer

D

Explanation

Atomic and ionic radii decreases down the group. Thus, ionic radii of group 15 elements are in the order
`Bi^(3+) gt Sb^(3+) gt As^(3+)`