Question

What happens to the size of atoms in p-block elements when we move from left to right in the same period?

• A. Size does not change
• B. Size increases then decreases
• C. Size increases
• D. Size decreases

Hint:

Atomic size decreases from left to right in a period.

Answer 1

The Correct Option is D

Step 1: Use effective nuclear charge.
$Z_{eff}$ increases across the period because new electrons shield each other only a little.

Step 2: Result.
A higher $Z_{eff}$ pulls the outer shell closer, so atomic radius decreases.

Final Answer:
Option (D). \[ \boxed{\text{decreases}} \]