Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2025 — 7 April, Evening Shift — Question 14

Choose the incorrect trend in the atomic radii $(r)$ of the elements.

Option A:
$\mathrm{r}_{\mathrm{Br}}<\mathrm{r}_{\mathrm{K}}$
Option B:
$\mathrm{r}_{\mathrm{Rb}}<\mathrm{r}_{\mathrm{Cs}}$
Option C:
$r_{M g} < r_{\text {Al }}$
Correct
Option D:
$r_{A t} < r_{C s}$

Answer: C

Step-by-step solution

$r_{M g}>r_{A I}$ due to lower effective nuclear change.

Answer key and solution verified before publishing.

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Exam: JEE Main 2025
Paper: 7 April, Evening Shift
Subject: Chemistry
Chapter: Periodicity of Elements and Periodic Properties
Topic: Periodicity in Physical Properties (shielding and sizes)

Choose the incorrect trend in the atomic radii (r) of the elements. | JEE Main 2025 PYQ with Solution · DhiX AI