
Olivia H. answered 11/24/23
Patient and Highly Experienced Chemistry and Math Tutor
Hello! The roman numberal tells you the charge of the first element (the metal), so in this case the charge of Tin is +4. Carbonate is a polyatomic (CO3) with a charge of -2. You can memorize the charges of polyatomcis, or refer to a polyatomic chart if your teacher allows. Therefore, the ions of Tin (IV) Carbonate are Sn4+ and CO32-. There is also a very helpful saying to help you learn and remember the polyatomics like carbonate (look up "Nick the Camel Ate a Clam for Supper in Phoenix" and study the explanation).