Question

Why do we sometimes use roman numerals in naming ionic compounds?

Answer 1

Roman numerals are used in naming ionic compounds when the metal cation forms more than one ion. The metals that form more than one ion are the transition metals, although not all of them do this.

Answer 2

Answer:

Sometimes roman numerals are used in naming ionic compounds when the metal cation forms more than one ion. The metals that form more than one ion are the transition metals