SSC CPO 2022 PYQ — Question 72

The correct answer is option 2 i.e. Atomic radius decreases across a period and increases down a group in the periodic table.

Atomic radius is the distance between the atom’s nucleus to the outer edge of the  electron cloud.It generally decreases across a period and increases down a group.Effective nuclear charge increases across a period as electron shielding remains constant.There is a greater distance between  the nucleus and the outermost orbital as the number of energy levels increases down the group. This results in a larger atomic radius.