Which one of the following is correct increasing order of size ?

Options

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

Explanation

`Na^(+)` and `F^(-)` ions are isoelectronic, therefore `F^(-)` has the large and `Na^(+)` has the lowest size. Further, Al with higher nuclear charge has lower size than Mg. Thus, the overall order is
`Na^(+)lt Al lt Mg lt F^(-)`