Group 7- the halogens

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Group 7- the halogens

  • poisonous non-metals which all have coloured vapours
  • low melting and boiling points
  • poor conductors of heat and electricity
  • exist as molecules made up of pairs of atoms, joined together by cotvalent bonds.
  • flourine: very reactive, poionous, pale yellow gas
  • chlorine: reactive, poisonous dense green gas. tested for by using damp litmus paper and if it is bleached, the gas is chlorine.
  • bromine: dense, poisonous dark orange- brown liquid, vapourises easily
  • iodine: poisonous, dark


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