The hydration energies of group 2 ions are approximately four times as much as those of group 1 ...

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The hydration energies of group 2 ions are approximately four times as much as those of group 1 ions. This is due to their
(A) smaller size and greater nuclear charge
(B) greater size and lower nuclear charge
(C) smaller size and lower nuclear charge
(D) greater size and greater nuclear charge
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