Group 7: The Halogens

• What are the properties of halogens?

  Poor conductors

  Low melting and boiling points

  Low densities
• What happens to reactivity as you go down group seven?

  The halogens get less reactive as you go down the group
• What are the uses of chlorine?

  Steralise drinking water

  Cleans swimming pools

  Forms bleach

  Used in insecticides, pesticides, etc.
• What are the uses of iodine?

  Antiseptic

  Steralising Sprays

  Used in plasters
• What colour is chlorine without any reaction?

  Pale green gas
• What colour is bromine without reaction?

  Orange-brown liquid/Brown in water
• What colour is iodine without reaction?

  Purple vapour/Grey Solid/Brown in water