In which of the following arrangements, the order is not co…

Chemistry Classification of Elements and Periodicity Ionisation Energy Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

In which of the following arrangements, the order is not correct according to the property indicated against it:

Increasing size : Cu2+< Cu+< Cu

Increasing IE1 : B < C < N < O

Increasing IE1 : B < Al <Ga< In < Tl

Increasing IE1 : Li < Na < K <Rb

Text Solution

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The correct answer is:

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(c, b, d)

Order of IE1 in 13th group : B > Al > Ga > In < Tl

(irregularity due to poor shielding of nuclrear charge by 3d & 4f electrons).

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