Question

How does Atomic Radius change as we move from left to right in a period?
A. Increases
B. Decreases
C. No Change
D. Firstly increases than decreases

Answer 1

Hint: Nuclear Force of the atom increases while moving left to right across the periodic table.Due to this force, the atom starts shrinking.

Complete answer:
When we move from left to right along a periodic table then the Atomic Radius of element is generally decreased because the electrons are added to the same shell, due to this they experience a great force from the nucleus or we can say that nucleus attracts electrons more strongly.
Atomic size refers to the distance from the atomic nucleus to the outermost electron orbit. Typically, atomic size increases on going down in a group, as the number of shells also increases and proton charge keeps increasing. But the size decreases on moving left to right across the period due to the contraction of atoms because of increasing nuclear force.

Hence, the correct option is (B).

Note: When the atomic radius decreases while moving from left to right across the period then the Atomic volume first decreases and then increases. And, Atomic radius increases in groups from top to bottom because new shells are added and the electrons are brought away from the nucleus.