8. The chemical formula for magnesium phosphate is Mg3(PO4)2. What does the 2 in the formula represent?
A. There are 2 groups of PO4 in the molecule.
B. There are 2 molecules of Mg3(PO4) in total.
c. There is 2 times as much phosphorus as there is oxygen in magnesium phosphate,
D. There is 2 times as much oxygen as there is phosphorus in magnesium phosphate.