When the following five anions are arranged in order of dec…

Chemistry Classification of Elements and Periodicity Atomic and Ionic Radius Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

When the following five anions are arranged in order of decreasing ionic radius, the correct sequence is

Se 2– , I – , Br – , O 2– , F –

I – , Se 2– , Br – , F – , O 2–

Se 2– , I – , Br – , F – , O 2–

I – , Se 2– , Br – , O 2– , F –

Text Solution

Verified by Experts

The correct answer is:

Across the period ionic size decreases as nuclear charge increases for successive addition of an electron but down the group increases due to increase in the number of atomic shells (effective nuclear charge remains nearly same).

O 2– = 140 pm, Se 2– = 198 pm, F – = 133 pm, Br – = 196 pm, I – = 220 pm.

So, the correct decreasing order of ionic radii. I – > Se 2– > Br – > O 2– > F – .

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