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HALOGEN
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I. (noun)
Sense 1
Meaning:
Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
Classified under:
Hypernyms ("halogen" is a kind of...):
group; grouping (any number of entities (members) considered as a unit)
Hyponyms (each of the following is a kind of "halogen"):
astatine; At; atomic number 85 (a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium)
atomic number 35; Br; bromine (a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water)
atomic number 17; chlorine; Cl (a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water))
atomic number 9; F; fluorine (a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite)
atomic number 53; I; iodin; iodine (a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks))
Context examples:
A compound that can increase human cancer risk and consists of hydrogen and carbon atoms arranged in a symmetrical 6-carbon ring structure with single and double bonds alternating around the ring (benzene ring) and in which at least one of the hydrogen atoms is substituted for a halogen (chlorine, bromine, fluorine) atom.
(Carcinogenic Halogenated Aromatic Hydrocarbon, NCI Thesaurus)
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