Which of the following order of radii is correct: | CGP Edu

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

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Which of the following order of radii is correct:

A

Li < Be < Mg

B

H + < Li + < H –

C

O < F < Ne

D

Li < Na < K < Cs < Rb

Text Solution

Verified by Experts

The correct answer is:

Atomic radius increases on moving top of bottom in a group due to increasing number of shells. However, it decreasing on moving left to right in a period due to increasing and addition of electrons to the saem shell. For , cation is smaller than parent atom while anion is bigger than parent atom. and are isoelectronic species. So, ionic size . Hence the correct order is .

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