The elements A, B, C, D and E have atomic numbers

Question:

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

(a) A and B

(b) B and D

(c) A and C

(d) D and E.

Solution:

(c). Elements A (Z = 9) and C (Z = 17) belong to the same group. It is a halogen family (group 17).

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