7. Use periodic trends and predict which of the following ions has the smallest radius. Na$^+$ Al$^{3+}$ F$^-$ O$^{2-}$
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List the following ions in order of increasing radius: $$ \begin{array}{lllll} \mathrm{Na}^{+} & \mathrm{O}^{2-} & \mathrm{Mg}^{2+} & \mathrm{F}^{-} & \mathrm{Al}^{3+} \end{array} $$
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