Q. The elements A,B,C,D,E have atomic numbers 9, 11, 17, 12and 13. Which elements belong to the same group?
A. A and B
B. B and D
C. A and C
D. D and E
Answer: A and B
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A. A and B
B. B and D
C. A and C
D. D and E
Answer: A and B