Question

(3) Atomic radius goes on increasing down
a group​

Answer 1

Answer:

Atomic radius is the distance from the atom’s nucleus to the outer edge of the electron cloud.

In general, atomic radius decreases across a period and increases down a group.  Across a period, effective nuclear charge increases as electron shielding remains constant.  A higher effective nuclear charge causes greater attractions to the electrons, pulling the  electron cloud closer to the nucleus which results in a smaller atomic radius.

Down a group, the number of energy levels (n) increases, so there is a greater distance between  the nucleus and the outermost orbital. This results in a larger atomic radius.

You can refer to this PDF for more information..

Hope it helps you..

eed1ef05502f747bb0939db8252e20a8.pdf