The elements A, B, C, D, and E have atomic numbers 9, 11, 17, 12 and 1 – InterviewSolution

1.	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
Answer» 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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