Know the charges of these ions:
• metals in Groups 1, 2 and 3:
Group 1: 1+
Group 2: 2+
Group 3: 3+
• non-metals in Groups 5, 6 and 7
Group 5: 3-
Group 6: 2-
Group 7: 1-
• Ag+, Cu2+, Fe2+, Fe3+, Pb2+, Zn2+
• hydrogen (H+), hydroxide (OH-), ammonium (NH4+), carbonate (CO32-), nitrate (NO¬3-), sulfate (SO42-)
