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The correct sequence that shows the decreasing order of the ionic radii of the elements is:
(a) \( \mathrm{Al}^{3+}\mathrm{Mg}^{2+}\mathrm{Na}^{+}\mathrm{F}^{-}\mathrm{O}^{2-} \)
(b) \( \mathrm{Na}^{+}\mathrm{Mg}^{2+}\mathrm{Al}^{3+}\mathrm{O}^{2-}\mathrm{F}^{-} \)
(c) \( \mathrm{Na}^{+}\mathrm{F}^{-}\mathrm{Mg}^{2+}\mathrm{O}^{2-}\mathrm{Al}^{3+} \)
(d) \( \mathrm{O}^{2-}\mathrm{F}^{-}\mathrm{Na}^{+}\mathrm{Mg}^{2+}\mathrm{Al}^{3+} \)
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