Question

Arrange the elements in increasing order of atomic radius Na, Rb, K, Mg.

• A. Na < K < Mg < Rb
• B. K < Na < Mg < Rb
• C. Mg < Na < K < Rb
• D. Rb < K < Mg < Na

Answer 1

The correct option is C Mg < Na < K < Rb

The increasing order of atomic radius is $Mg<Na<K<Rb$.

On moving down the group, the atomic radius increases. On moving from right to left in a period, the atomic radius decreases.