1. halogen

noun. (ˈhælədʒən) Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions.
Synonyms
iodine fluorine I atomic number 85 Cl F grouping atomic number 9 Br chlorine atomic number 53 atomic number 17 group astatine iodin At bromine atomic number 35
Antonyms
fresh water inactivity
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