halogen definition

  • noun:
    • Any of a team of five chemically associated nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.
    • Any section of group 7, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal.
    • An electro-negative factor or radical, which, by combo with a metal, types a haloid sodium; specifically, chlorine, fluorine, bromine, and iodine; occasionally, in addition cyanogen. See Chlorine family members, under chlorine.
    • In chem., a component that forms a compound of a saline nature by its direct union with a metal.
    • any one of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) being all monovalent and easily form unfavorable ions

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