The correct order of radii is :

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

Published by: CGP EDU Academic Team

Published on: August 13, 2026

N < Be < B

F – < O 2– < N 3–

Na < Li < K

Fe 3+ < Fe 2+ < Fe +4

Text Solution

Verified by Experts

The correct answer is:

All are isoelectronic species having 10 electrons in each species but different nuclear charge and thus ionic radius ∝ .

So correct order is 9 F – < 8 O 2– < 7 N 3– .

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