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Consider the ions \( \mathrm{Li}^{+}, \mathrm{Na}^{+}, \mathrm{Be}^{2+} \), and \( \mathrm{Mg}^{2+} \). Which two are closest to one another in size?
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(a) \( \mathrm{Li}^{+} \)and \( \mathrm{Na}^{+} \)
(b) \( \mathrm{Be}^{2+} \) and \( \mathrm{Mg}^{2+} \)
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(c) \( \mathrm{Be}^{2+} \) and \( \mathrm{Li}^{+} \)
(d) \( \mathrm{Li}^{+} \)and \( \mathrm{Mg}^{2+} \)
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