Ionic Formulae

• Monatomic ions


  Ions with a single atom
• Ions from the same periodic table group have the same charge
• Ionic compound


  Compound where the charges balance: positive = negative
• Writing & Balancing equations

  1. Word equation

  2. Chemical equation

  3. Balancing equation
• For a chemical reaction to occur there must be the same number and type of atoms on both sides of the equation
• Changing the small numbers changes what type of chemical it is, so we can't do that when balancing an equation
• Balanced chemical equations


  • 2Na + Br2 → 2NaBr
  • Ca + Cl2 → CaCl2
• Sometimes, chemical equations are already balanced and we don't need to worry