The correct order of stability to form ionic compounds among `Si^(4+),Al^(3+),Mg^(2+),` and `Na^(+)` is `:`

Options

A. `Si^(4+) gt Al^(3+) gt Mg^(2+) gt Na^(+)`
B. `Al^(3+) gt Si^(4+) gt Mg^(2+) gt Na^(+)`
C. `Na^(+) gt Si^(4+) gt Mg^(2+) gt Al^(3+)`
D. `Na^(+) gt Mg^(2+) gt Al^(3+) gt Si^(4+)`

Answer

4

Explanation

According to Fajan's rule the polarising power increases with increasing oxidation state of element leading to increasing covalent character.