Which one of the following is the smallest in size?

Options

A. `N^(3-)`
B. `O^(2-)`
C. `F^(-)`
D. `Na^(+)`

Answer

D

Explanation

`Na^(+) lt F^(-) lt O^(2-) lt N^(3-)` All are isoelectronic, effective charge is highest for `Na^(+)` so it has the smallest size.