Which of the following has the smallest size

Options

A. `Na^(+)`
B. `Mg^(+2)`
C. `Cl^(-)`
D. `F^(-)`

Answer

B

Explanation

As the nuclear charge per `e^(-)` is maximum in `Mg^(+2)`, it has smallest size among `Na^(+), Mg^(+2), Cl^(-) and F^(-)`.