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The Ca2+ ion is larger than the Mg2+ ion.

The ionic radii are: 86pm for the Mg2+ and 114pm for the Ca2+.

Besides the fact that the Ca2+ has more electrons this can be explained by the principle of electron shielding. Electron shielding is when lower level electrons block the EFC(effective nuclear charge) from effecting the valence electrons of an ion. Ca2+has more electrons than Mg2+ so more electron shielding occurs.

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