Write the formula of magnesium phosphate using criss cross method
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Magnesium phosphate is Mg3(PO4)2. The subscripts are calculated using the LCM (least common multiple) of the ionic charges: Mg ions are +2 and PO4 ions are -3, so the LCM is 6. This means that 3 Mg ions are needed to combine with 2 PO4 ions.
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