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Classification of Elements and Periodicity in Properties
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24/08/2021 10:57 am
Topic starter
The order of increasing sizes of atomic radii among the elements O, S, Se and As is
(a) As < S < O < Se
(b) Se < S < As < O
(c) O < S < As < Se
(d) O < S < Se < As
1 Answer
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24/08/2021 10:59 am
Correct answer: (d) O < S < Se < As
Explanation:
On moving down in a group atomic radii increases due to successive addition of extra shell hence O < S < Se
Further As is in group 15 having one less electron in its p orbital hence have higher atomic radii than group 16 elements. i.e., O < S < Se < As