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Halogens - Group 7

  • Poisonous
  • Diatomic molecules
  • Non metals
  • React in similar ways
  • 7 electrons in outer shell
  • Very reactive
  • Form 1- ions
  • Reactivity decreases down the group; outer shell is further from positive nucleus, forces of attraction get less.
  • Form ionic bonds with metals and covalent bonds with non metals.

States at room temp:

  • Flourine - yellow gas
  • Chlorine - green gas
  • Bromine - dark red liquid (forms red/brown vapour)
  • Iodine - dark grey solid (purple vapour)
  • Astatine - black solid


  • Chlorine gas - bleaches damp indicator


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