Why are Roman numerals needed in the names of ionic compounds containing a metal that forms more than one type of ion? Type one contains a metal with a invariant charge-One that does not vary from one compound to another. Type two contains a metal with a charge that can differ in different compounds. Match the items in the left column to the appropriate blanks in the sentences on the right

Why are Roman numerals needed in the names of ionic compounds containing a metal that forms more than one type of ion Type one contains a metal with a invariant class=