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Question


If the radius of an element X of electronic configuration 2, 8, 3 is 0.76 A0, the radius of element Y of electronic configuration 2, 8, 5 will be :


A
0.64 A0
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B
0.76 A0
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C
0.88 A0
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D
1.08 A0
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Solution

The correct option is A 0.64 A0
Given :
EC of X is 2, 8, 3
EC of Y is 2, 8, 5 since they belong to same period, atomic size decreases from left to right.
Element X is to the left of element Y.
Hence, atomic radius of Y is less than 0.76oA i.e., 0.64oA.

Hence, option (A) is the correct answer.


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