Chemistry: The Halogens

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Group 7 = 7 electrons in the outer shell. 

  • They are all non-metals. 
  • They are all diatomic = molecules of two atoms. 
  • F2 not F, Cl2 not Cl, etc. 
  • They are all toxic vapors. i.e. they are poisonous. 
  • Fluorine, Chlorine, Bromine, iodine, astatine. 
  • Fluorine is a yellow gas. 
  • Chlorine is a green gas.
  • Bromine is a dark red liquid. 
  • Iodine is a dark grey solid or a purple vapor. 
  • Astatine is probably  black - but




Really good, thanks

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