The ionic radius of \( \mathrm{Na}^{+} \)ion is \( 1.02 \AA \). The ionic radii (in \( \AA \) ) ...

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The ionic radius of \( \mathrm{Na}^{+} \)ion is \( 1.02 \AA \). The ionic radii (in \( \AA \) ) of \( \mathrm{Mg}^{2+} \) and \( \mathrm{Al}^{3+} \), respectively, are:
(a) 1.05 and 0.99
(b) 0.72 and 0.54
(c) 0.85 and 0.99
(d) 0.68 and 0.72
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