On going down a main subgroup in the periodic table (example \( \mathrm{Li} \) to \( \mathrm{Cs}...

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On going down a main subgroup in the periodic table (example \( \mathrm{Li} \) to \( \mathrm{Cs} \) in IA or Be to \( \mathrm{Ba} \) in IIA) the expected trend of change in atomic radius is a:
(A) continuous decrease
(B) continuous increase
(C) periodic one, an increase followed by a decrease
(D) periodic one, a decrease followed by an increase
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