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Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.
1. Of or relating to the group of elements that are halogens.
2. Of or relating to a bright incandescent light bulb containing a halogen gas that prevents the filament from disintegrating at higher temperatures.
[Swedish : halo-, halo- + -gen, -gen.]
ha·log′e·nous (hă-lŏj′ə-nəs) adj.
(Elements & Compounds) any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
[C19: from Swedish; see halo-, -gen]
hal•o•gen(ˈhæl ə dʒən, -ˌdʒɛn, ˈheɪ lə-)
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.
ha•log•e•nous (hæˈlɒdʒ ə nəs) adj.
Any of a group of five nonmetallic elements with similar properties. The halogens are fluorine, chlorine, bromine, iodine, and astatine. Because they are missing an electron from their outermost shell, they react readily with most metals to form salts. The halogens are located in the column of the Periodic Table that is second from the right. See Periodic Table.
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|Noun||1.||halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions|
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, fluorine, F - 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