Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions.
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Words linked to "Halogen" : astatine, atomic number 9, atomic number 17, cl, atomic number 35, iodine, group, fluorine, grouping, at, F, bromine, iodin, br, chlorine, atomic number 53, atomic number 85, i |
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