2.1.2 (Compounds, formulae, and equations)

• Nitrate ion:

  A nitrate ion has a negative (1-) charge.

  (One Nitrogen atom with three Oxygen atoms.)

  
• Sulphate ion:

  A sulphate ion has a 2- charge.

  (One Sulphur atom and four Oxygen atoms.)

  
• Carbonate ion:

  A carbonate ion has a 2- charge.

  (One Carbon atom and three Oxygen atoms.)

  
• Hydroxide ion:

  A hydroxide ion has a negative (1-) charge.

  (One Oxygen atom and one Hydrogen atom.)

  
• Ammonium ion:

  An ammonium ion has a positive (1+) charge.

  (One Nitrogen atom and four Hydrogen atoms.)

  
• Zinc ion:

  A zinc ion has a 2+ charge.

  
• Silver ion:

  A silver ion has a positive (1+) charge.

  
• State symbols:

  • Solid (s)
  • Liquid (l)
  • Gas (g)
  • Aqueous (aq)