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