Flow Chart for Naming Simple Inorganic Compounds The flowchart is adapted from p. 131-132 of the February 1983 issue of the Journal of Chemical Education. Does the formula begin with H? No Yes Are there two atoms, both the same? Yes No It is an acid. Does the acid contain a polyatomic ion? (More than two elements. Yes No It is the diatomic gas hydrogen. Does it begin with a metal which has more than one oxidation number? Fe, Ni, Cu, Sn, Hg, Pb, Co, Cr, Au No Yes Does the polyatomic end in -ate or -ite? -ate -ite Name the first element followed by its oxidation number (Roman numeral) Name the polyatomic ion, replacing -ate with -ic. Add the word acid. Does the formula contain a polyatomic ion? (More than two elements.) No Yes Is the polyatomic written first? No Yes Name the polyatomic ion, replacing -ite with -ous. Add the word acid. Name the first element, then the polyatomic ion. (If two elements are present, name both, then the polyatomic ion.) Write the prefix hydro, then the name of the second element with the -ic ending. Add the word acid. Name the polyatomic first, then name the element second. If there are two polyatomics, name the first, then the second Are both elements nonmetals? No Yes Name the first element, then the second element with -ide ending. Are both elements the same? No Yes Name the first element using the proper prefix (di, tri, etc.), but never mono. Name the second element with the proper prefix (including mono) and the -ide ending. It is a diatomic element. The compound has the same name as the element.