halogenn.
/ˈhaləʊdʒɛn/ Chemistry.
An element or substance which forms a salt by direct union with a metal. The halogens are chlorine, fluorine, bromine, iodine, and the compound cyanogen. In modern use, any of the elements of group 7 of the periodic table, viz. fluorine, chlorine, bromine, iodine, and astatine.
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halogen1844
1844 Proc. Amer. Philos. Soc. 1841–3 2 219 The epithet halogen is applied to bodies whose binary compounds with metals are deemed salts.
1867 C. L. Bloxam Chemistry 10 A salt-radical or halogen is a substance which forms an acid when combined with hydrogen. Examples.—Chlorine, which forms hydrochloric acid (HCl); Cyanogen (C2N), which forms hydrocyanic acid (HC2N).
1872 H. Watts Dict. Chem. III. 6 Halogen, the electro-negative radicle of an haloïd-salt.
1880 Nature 22 Jan. 290/1 Displacement between oxygen and the halogen elements united with metals.
1884 T. S. Humpidge tr. H. Kolbe Short Text-bk. Inorg. Chem. 96 The halogens or salt-producers. The four elements chlorine, bromine, iodine, and fluorine are grouped together under this name.
1959 Nomencl. Inorg. Chem. (I.U.P.A.C.) 6 The use of the collective names: halogens (F, Cl, Br, I, and At),..may be continued.
Derivatives
haˈlogenated adj. combined with a halogen.
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halogenated1882
1882 Nature 9 Feb. 353/2 The action of halogenated..radicals on the potassic compound of pyrol.
halogeˈnation n. the introduction of an atom of a halogen into a molecule of a compound by addition or substitution.
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halogenation1911
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halogenation1911
1911 Chem. Abstr. 5 1436 (heading) Halogenation of benzene monohalides... The expts...were carried out at 55–75° without a diluent.
1966 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. II. xxxii. 463 Some of the interhalogens provide convenient solvents for halogenation reactions, particularly in view of their partial ionization.
haˈlogenous adj. of the nature of a halogen.
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halogenous1846
1846 B. H. Smart Walker's Pronouncing Dict. (ed. 2) The simple halogenous bodies or halogens at present known, are chlorine, fluorine, iodine and bromine.
This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2019).
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