1. Naming Ionic Compounds
Contains these elements: 1 Metal and 1 Nonmetal
Rules:
Cation is written first - Capitalize
If it is a metal with multiple ions (most transition metals), include a Roman Numeral
Anion is written second- lowercase
(Remember the ending of the anion is changed to-ide)

2. You try… K3 N Mg O Challenge: SnO2 Examples: Li Br Lithium bromide
Fe Cl2
Iron (II) chloride
You try…
K3 N
Potassium nitride
Mg O
Magnesium oxide
Challenge: SnO2
Tin (IV) oxide

3. Polyatomic ion
Polyatomic ion – a molecular compound with a charge due to missing or extra electrons

4. Polyatomic Ions Hydronium H3O+ Hydroxide OH- Acetate C2H3O2-
Nitrate NO3-
Cyanide CN-
Chlorate ClO3-
Sulfate SO42-
Carbonate CO32-
Phosphate PO43-
Ammonium NH4+

5. Writing formulas Write the cation and anion formulas
Magnesium phosphate
Mg2+ PO43-
Draw parenthesis around the polyatomic ion with charge on outside
Mg2+ (PO4)3-
Use criss-cross to bring charges down
Write ionic formula
Mg3(PO4)2