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Which of the following species will have...

Which of the following species will have the largest and the smallest size `Mg, Mg^(2+), Al, Al^(3+)`?

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Atomic radii decrease along the period. Cations are smaller than their parent atomes. Among isoelectronic species the one with the larger positive nuclear charge will have a smaller radius.
The largest species is `Mg`, the smallest one is `Al^(3+)`.
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