(D) The hydration energy of $Mg^{2+}$ is significantly higher than that of $Mg^+$. This large release of energy during the hydration of the divalent i

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The hydration energy of the divalent magnesium ion is very high.

(D) The hydration energy of $Mg^{2+}$ is significantly higher than that of $Mg^+$. This large release of energy during the hydration of the divalent ion compensates for the energy required to remove the second electron,making $Mg^{2+}$ the stable form in aqueous solutions.