Answer:
(c) Electronic
configuration of A (atomic number 9) is 2, 7.
Electronic
configuration of B (atomic number11) is 2, 8, 1.
Electronic
configuration of C (atomic number 17) is 2, 8, 7
Electronic
configuration of D (atomic number 12) is 2, 8, 2.
Electronic
configuration off (atomic number 13) is 2, 8, 3.
Elements
which differ in atomic number by 8 i.e., 9 (A fluorine) and 17 (Cl, chlorine)
lie in the same group i.e., group 17 (halogens).
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