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Top 20 Directory:
Top : Science : Chemistry : Elements : Halogens
  		• Astatine@
  		• Bromine@
  		• Chlorine@
  		• Fluorine@
  		• Iodine@
    Sites:
  		• Doc Brown's Chemistry Clinic: The Halogens: Includes an overview, general properties, reactivity trends, and information about the industrial electrolysis of sodium chloride solution.
  		• The Chemistry of the Halogens: Covers their properties, methods of preparation, general trends, the hydrogen halides, and oxyacids of the halogens and their salts.
  		• Visual Elements: The Halogens: Overview, general properties, and chemical data for the group.
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