$Mg$ 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 enthalpy of the divalent magnesium ion is very high
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