The size of the following species increases in the order

Options

A. `Al lt Mg lt F^(-) lt Na`
B. `F^(-)Al lt Na^(+) gt Mg^(2+)`
C. `Mg^(2+) lt Na^(+) lt F^(-) lt Al`
D. `Na^(+)Al lt F^(-) lt Mg^(2+)`

Answer

C

Explanation

`Mg^(2+) lt Na^(+) lt F lt Al`
`F^(-)` has bigger size than `Mg^(2+)` and `Na^(+)` due to small nuclear charge.