The differences in atomic number between successive members of group 17 (F, Cl, Br, I, At), going down the group, are

A8, 8, 18, 18
B8, 18, 18, 32
C8, 18, 32, 32
D18, 18, 32, 32

Answer: B

The atomic numbers are 9, 17, 35, 53 and 85. The differences are 8, 18, 18 and 32, matching the lengths of periods 2 and 3, then 4 and 5 (18 each), and finally period 6 (32).

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