Question

The atomic radius decreases in a period due to :

• A. increase in nuclear attraction
• B. decrease in nuclear attraction
• C. increase in number of electrons
• D. decrease in number of electrons

Answer 1

The correct option is A increase in nuclear attraction

Atomic radius decreases with increase in Z-effective. More the Z-effective nuclear charge more the attraction from the nucleus, less the size.

In a period, the effective nuclear charge increases on going from left to right.

Hence, the correct option is $\text{A}$