Q. The element A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
A. A and B
B. B and D
C. A and C
D. D and E
Answer: A and C
A. A and B
B. B and D
C. A and C
D. D and E
Answer: A and C