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JEE Main 20257 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
7 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2025 · 7 April · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

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

Choose the incorrect trend in the atomic radii (r)(\mathrm{r}) of the elements :

Options

  1. ArBr<rK\mathrm{r}_{\mathrm{Br}} \lt \mathrm{r}_{\mathrm{K}}
  2. BrMg<rAl\mathrm{r}_{\mathrm{Mg}} \lt \mathrm{r}_{\mathrm{Al}}
  3. CrRb<rCs\mathrm{r}_{\mathrm{Rb}} \lt \mathrm{r}_{\mathrm{Cs}}
  4. DrAt<rCs\mathrm{r}_{\mathrm{At}} \lt \mathrm{r}_{\mathrm{Cs}}

Correct answer

B. rMg<rAl\mathrm{r}_{\mathrm{Mg}} \lt \mathrm{r}_{\mathrm{Al}}

Step-by-step solution

In a period from left to right atomic size decreases.
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