1. Chemical Names and Formulas
9.2: Naming and Writing Formulas for Ionic Compounds

2. Writing Formulas of Binary Ionic Compounds
Write the symbol of the cation then anion
Add subscripts to balance charges (criss cross)
Potassium chloride = KCl
Iron (III) Oxide = ?
Copper (II) Sulfide = ?
Potassium Nitride = ?

3. Naming Binary Ionic Compounds
Cation name first, then the anion.
NaBr = Sodium Bromide
CaCl2 = ?
CuO = Copper (II) Oxide
SnF2 = ?

4. Compounds with Polyatomic Ions
Watch for the –ite or –ate endings
Write the symbol for the cation then the formula for the polyatomic ion
Balance the charges (criss cross)
Sodium nitrate = NaNO3
Lithium carbonate = ?
Ammonium sulfate = ?

5. The Other Way
To name a compound containing a polyatomic ion, state the cation then the anion.
Mg(NO3)2 = Magnesium Nitrate
(NH4)2C2O4 = ?
Ca3(PO4)2 = ?
CaSO4 = ?