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Mg3(C6H5O7)2 is the molecular formula for magnesium citrate. Magnesium is a Group IIA element and like all members of this group readily ionizes to Mg+2. C6H5O7 is the formula for the polyatomic citrate ion which has a negative three charge. Molecules are stable combination of atoms that are electronically neutral. It takes three Mg+2 to cancel out the charge of two C6H5O7-3.

Parenthesis are placed around the citrate ion to show that the subscript 2 only applies to the citrate ion.

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Q: Where does the 3 come from in Mg3 C6H5O7 2?
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