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The elements A, B, C, D, and E have atomic numbers 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group?

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The elements A, B, C, D, and E have atomic numbers 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group? 

A. A and B 

B. B and D 

C. A and C 

D. D and E

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1 Answer

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The all the above-mentioned atomic numbers belong to 2nd and 3rd groups which have a difference of 8 between them so the numbers which have a difference of 8 is ‘9’ and ‘17’. So, the correct option is (c).

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