How does atomic radius vary in a period and in a group How yoy explain the variation - Chemistry - Classification of Elements and Periodicity in Properties

Question

How does atomic radius vary in a period and in a group ? How yoy
explain the variation ?

Shveta Dua · Accepted Answer

Hi,
On moving across a period, the valence shell remains the same
and the electrons are increasing by one unit As a result, the
nuclear charge increases thus the atomic radius decreases
On moving down a group, the shells go on increasing As a
result, the nuclear charge decreases
Thus, the atomic radius increases down a group
Hope this helps
Cheers!

How does atomic radius vary in a period and in a group ? How yoy explain the variation ?