Final answer:
The correct name of the compound Mn3(PO4)2 is manganese(II) phosphate.
Step-by-step explanation:
The correct name of the compound Mn3(PO4)2 is manganese(II) phosphate. In this compound, the manganese ion has a +2 charge, as indicated by the Roman numeral II in the name. The phosphate ion has a -3 charge, which requires three phosphate ions to balance the charge of the three manganese ions.