Which of the following two ions are closer to one another in size ?

Options

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

Answer

D

Explanation

Because of diagonal relationship `,Li^(+)=76`pm and `Mg^(2+)=72` pm.