Which of the following sets of elements ...

Which of the following sets of elements belongs to group 15 (atomic numbers are given in each set)?

A

7, 15, 23, 33

B

15, 33, 65, 115

C

7, 15, 33, 51

D

5, 13, 31, 49

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The correct Answer is:

C

15th group elements are N, P, As, Sb, Bi.

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