chem lesson 4

• Multivalent Metals


  Some metals have more than one possible charge ("valence")
• Elements with multiple possible charges

  • Copper
  • Iron
  • Lead
  • Gold
  • Nickel
  • Tin
  • Platinum
  • Mercury
• Possible Charges


  • +1, +2
  • +2, +3
  • +2, +4
  • +1, +3
  • +2, +3
  • +2, +4
  • +2, +4
  • +1, +2
• Roman Numerals


  • I, II
  • II, III
  • II, IV
  • I, III
  • II, III
  • II, IV
  • II, IV
  • I, II
• Writing Formulas for Ionic Compounds with Multivalent Metals

  1. Use the same method as simple ionic compounds

  2. Remember to use the Roman numeral in brackets as the charge for the metal
• Examples of writing formulas with multivalent metals


  • Lead (IV) Sulphide
  • Cobalt (III) Chloride
  • Mercury (I) Oxide
• Naming Ionic Compounds with Multivalent Metals


  Determine the charge of the metal and indicate it with a Roman numeral in brackets after the metal name
• Examples of naming ionic compounds with multivalent metals


  • Iron (III) oxide
  • Gold (III) chloride
  • Tin (II) oxide