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