$Mg$ forms $Mg^{2+}$ but not $Mg^+$. The reason is ...
- AMagnesium $(II)$ carbonate is insoluble in water.
- BMetals generally prefer higher oxidation states.
- CThe ionic radius of $Mg(II)$ is smaller than that of $Mg(I)$.
- DThe hydration energy of the divalent magnesium ion is very high.
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