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" : i, grouping, atomic number 9, at, br, atomic number 85, iodin, bromine, chlorine, atomic number 53, atomic number 17, group, atomic number 35, astatine, F, fluorine, iodine, cl |
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