Which of the following order of radii is correct :

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

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Li < Be < Mg

H+< Li+< H–

O < F < Ne

Li < Na < K < Cs <Rb

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Verified by Experts

The correct answer is:

Atomic radius increases on moving top to bottom in a group due to increasing number of shells. However, it decreasing on moving left to right in a period due to increasing Zeff and addition of electrons to the same shell.

For H; cation is smaller than parent atom while anion is bigger than parent atom. H– and Li+ are isoelectronic species. So, ionic size . Hence the correct order is H+ < Li+ < H–.

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