The set representing the correct order of ionic radius is

Options

A. `Li^(+) gt Be^(2+) gt Na^(+) gt Mg^(2+)`
B. `Na^(+) gt Li^(+) gt Mg^(2+) gt Be^(2+)`
C. `Li^(+) gt Na^(+) Mg^(2+) gt Be^(2+)`
D. `Mg^(2+) gt Be^(2+) gt Li^(+) gt Na^(+)`

Answer

B

Explanation

Is the correct order.
In moving from left to right radii decreases while they increase downwards. `Li^(+)` and `Mg^(2+)` are diagonally related. The correct order is :
`Na^(+) gt Li^(+) gt Mg^(2+) gt Be^(2+)`