If four different elements A , B , C and D having electronic configuration as A=[ Ne ] 3 ~s ^2 3 p ^4 , B =[ Ne ] 3 ~s ^2 3 p ^5, C =[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 4 p ^4 and D =[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 4 p ^5 . Identify the element with largest atom

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If four different elements A , B , C and D having electronic configuration as A=[ Ne ] 3 ~s ^2 3 p ^4 , B =[ Ne ] 3 ~s ^2 3 p ^5, C =[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 4 p ^4 and D =[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 4 p ^5 . Identify the element with largest atomic radius.

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Correct answer: C. C

Elements C and D belong to period 4 , while elements A and B are from period 3, therefore the former will be larger in size. The configuration of C and D is 4 ~s ^2 4 p ^4 and 4 ~s ^2 4 p ^5 respectively, therefore D lies to the right of C and would be smaller than C . Element C will have the largest atomic radius.

If four different elements A , B , C and D having electronic configuration as A=[ Ne ] 3 ~s ^2 3 p ^4 , B =[ Ne ] 3 ~s ^2 3 p ^5, C =[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 4 p ^4 and D =[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 4 p ^5 . Identify the element with largest atomic radius.

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