Formula of ionic compounds

• Ionic compound


  The charges on the ions have to cancel out to leave an overall charge of zero
• Ionic compounds


  • Have no overall charge
• Determining the formula of an ionic compound

  1. Identify the charges on the ions

  2. Determine how many of each ion are needed to cancel out the charges

  3. Write the formula with the appropriate number of each ion
• In an exam, you will not see any question more difficult than the ones shown