halogen

Noun
  1. Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions (synset 114928812)
    is a type of: group, grouping - any number of entities (members) considered as a unit
    subtypes:
    • astatine, at, atomic number 85 - a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
    • atomic number 35, br, bromine - a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
    • atomic number 17, chlorine, cl - a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)
    • atomic number 9, f, fluorine - a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite
    • atomic number 53, i, iodin, iodine - a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)

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