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Noun halogen has 1 sense
  1. halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
    --1 is a kind of
    group, grouping
    --1 has particulars:
     astatine, At, atomic number 85; bromine, Br, atomic number 35; chlorine, Cl, atomic number 17; fluorine, F, atomic number 9; iodine, iodin, I, atomic number 53
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