From the following ions and their radii (in pm), choose a pair that gives the strongest ionic bonding and a pair that gives the weakest:

${\mathbf{Mg}}^{\mathbf{2}\mathbf{+}}\mathbf{72}\mathbf{;}\mathbf{}{\mathbf{K}}^{\mathbf{+}}\mathbf{138}\mathbf{;}\mathbf{}{\mathbf{Rb}}^{\mathbf{+}}\mathbf{152}\mathbf{;}\mathbf{}{\mathbf{Ba}}^{\mathbf{2}\mathbf{+}}\mathbf{135}\mathbf{;}\mathbf{}{\mathbf{Cl}}^{\mathbf{-}}\mathbf{181}\mathbf{;}\mathbf{}{\mathbf{O}}^{\mathbf{2}\mathbf{-}}\mathbf{140}\mathbf{;}\mathbf{}{\mathbf{l}}^{\mathbf{-}}\mathbf{220}$

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