Naming Compounds Concept Map Metal and Nonmetal 2 Nonmetals Metal Name using prefixes to indicate the number of atoms present. Change the ending of the second element to ide. Only use mono-on the second element Representative Transition Just name it Just name it and use Roman numerals to indicate the charge Nonmetal Hydrogen Is Oxygen Present? Yes, change the ending and add the word acid. -ate changes to –ic -ite changes to –ous No, use the prefix -hydro Change the ending to –ic and add the word acid Representative Polyatomic Change the ending to -ide Just name it