Naming Binary Ionic Compounds Binary just means that

Naming Binary Ionic Compounds • “Binary” just means that the compound has two elements in the formula. • To name any binary ionic compound , place the cation first, followed by the anion name. • Use the correct chemical name of the cation • Replace the ending of the anion with -ide • The name of Cs 2 O, is cesium oxide.

More on Ionic Compounds Dealing with the Transition Metals (includes Pb and Sn too) • Transition metals can have more than one charge. For example there can be Fe+2 and Fe+3. • For this reason we must tell people the charge on the transition metal- use a roman numeral in parentheses. Ex. Iron (II) or Iron (III) • Roman Numerals: I = 1, II = 2, III = 3, IV = 4, V = 5, VI = 6, VII = 7

More on Ionic Compounds • Exceptions: There are some transition metals that only have one charge. These transition metals do NOT use a roman numeral. They are silver (Ag+1), cadmium (Cd+2), and zinc (Zn+2). • Example: Ag 2 S Silver sulfide NOT Silver (I) sulfide because silver is ALWAYS +1 and there is no need to specify its charge.

Naming Ternary Ionic Compounds (3+ Elements) • Naming Compounds containing Polyatomic Ions (a group of atoms with a charge) l. Name the metal ion 2. Name the polyatomic ion Example: KNO 3 potassium nitrate

Naming Ternary Ionic Compounds (3+ Elements) Or… l. Name the polyatomic ion 2. Name the nonmetal ion, changing the ending to “ide” Example: NH 4 Cl ammonium chloride