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=](https://us-static.z-dn.net/files/d4f/77f42a8bbc66bf8223b728d1c3718643.png)