Group O elements

• • All have eight electrons in their outer Shell (apart from helium which has two) giving them a full outer Shell
  • meaning they are unreactive as they don't need to loose or gain electrons
  • exist as monatomic gases
  • They are colourless gases at room temperature
  • non flammable
• Patterns as you move down the group:

  • Boiling points increase
  • this is because of an increase of electrons in each atom causing greater intermolecular forces which are harder to overcome