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JEE Main 201322 AprilOnline
Exam
JEE Main
Year
2013
Date
22 April
Mode
Online
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2013 · 22 April · Online · Chemistry · Classification of Elements and Periodicity in Properties

The order of increasing sizes of atomic radii among the elements O,...

The order of increasing sizes of atomic radii among the elements O, S\mathrm{S}, Se and As is :

Options

  1. AAs <S<O<Se< \mathrm{S} < \mathrm{O} < \mathrm{Se}
  2. BSe<S<As<O\mathrm{Se} < \mathrm{S} < \mathrm{As} < \mathrm{O}
  3. CO << S << As <Se< \mathrm{Se}
  4. DO<S<Se<As\mathrm{O} < \mathrm{S} < \mathrm{Se} < \mathrm{As}

Correct answer

C. O << S << As <Se< \mathrm{Se}

Step-by-step solution

On moving down in a group atomic radii increases due to successive addition of extra shell hence O\mathrm{O}< S\mathrm{S}<  Se \text{ Se }Further As is in group 15 having one less electron in its pp orbital hence have higher atomic radii than group 16 elements. i.e., O<S<Se<As\mathrm{O} \lt \mathrm{S} \lt \mathrm{Se} \lt \mathrm{As}
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