Question

What types of metals require the use of a Roman numeral in the name of their iconic compounds

Answer 1

Answer: Transition metal compounds that are composed of a (positive) transition metal ion and a negative anion; those having more than a +1. Charge. Iron makes a good example, for Iron III or Iron IV.

Step-by-step explanation:

Answer 2

The answer is transition metals because they have no specific charge except for 1 or 2 of them