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Magnesium chloride is an neutral ionic compound. In neutral ionic compounds, the positive charge of the cations must balance out the negative charge of the anions.

In the case of magnesium chloride, magnesium is the cation with an ionic charge of +2 and chlorine is the anion with an ionic charge (each) of -1.

Since two chlorine anions together have a charge of -2 total, they balance out the one magnesium cation with a charge of +2.

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Q: Why the formula of magnesium chloride is MgCl2?
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