Which one of the following ions has the highest value of ionic radius?

Options

A. `Li^(+)`
B. `B^(2+)`
C. `O^(2-)`
D. `F^(-)`

Answer

C

Explanation

`O^(2-)` and `F^(-)` have two shells while `Li^(+)` and `B^(3+)` have only shell. Also, `O^(2-) gt F^(-)` (for isoelectronic species, as `Z` increases, size decreases).