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fluoride, a salt of hydrofluoric acid; see hydrogen fluoride. See also fluoridation; fluorine.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a compound of fluorine with other elements. The fluorides of elements in Groups I and II of Mendeleev’s periodic system are solids with an ionic element—fluorine bond; the fluorides of most elements in Groups VI–VII are gases with a covalent element—fluorine bond. Compounds containing a C—F bond form numerous classes of fluorocarbons; the higher fluorides of many metals, such as U, V, Mo, W, and Re, are volatile substances. Fluorides occur in nature as constituents of minerals. In terms of chemical properties, the fluorides of halogens, inert gases, oxygen, nitrogen, and many other elements in higher oxidation states (for example, PtF5, CoF3, and AgF2) are oxidizing agents; the fluorides of arsenic, antimony, and boron are strong Lewis acids (seeACIDS AND BASES).

Fluorides can be obtained by the interaction of fluorine with elements, by the action of hydrogen fluoride on metals, and by other methods.

Hydrogen fluoride, oxyfluorides, and nitrogen fluorine compounds are widely used. The chlorine fluorides C1F3 and C1F5 are rocket-fuel oxidizing agents; C1F3 also serves as a fluorinating agent in the preparation of uranium hexafluoride, UF6, which is used in the atomic industry for the isotope separation of uranium. The volatile fluorides of metals are used in the application of metallic coatings. The fluorides of lithium, magnesium, calcium, strontium, barium, and other metals are used as raw materials in the manufacture of optical glass. (See alsoCRYOLITE.)


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The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(inorganic chemistry)
A salt of hydrofluoric acid, HF, in which the fluorine atom is in the -1 oxidation state.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. any salt of hydrofluoric acid, containing the fluoride ion, F--
2. any compound containing fluorine, such as methyl fluoride
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Flouride, a naturally occuring mineral, has been added to the water piped to Birmingham since the 1960s.
That same engineering goes into our optics," Kortemeier said, who easily explains the merits of SCHOTT flouride ED-glass, aspherical lenses, Quick Close Focus, magnesium construction and more.
Distribution of flouride in saliva and plaque fluid after a 0.048 mol/L NaF rinse.
Apa, fluoride also is an important component in the daily oral care routine: "Consumers have suddenly realized that flouride is not meant to be used twice a year in large doses.
Moreover, primary care providers are well placed to address the need for flouride and to advocate on behalf of a high-risk patient to ensure that he or she sees a dentist at age 1 year.
Lead article of this issue is "When a Child Hurts Other Children." Other topics include: Norovirus and Stomach Flu; Breath-holding; Healthy Drink Choices; Infant Formula and Flouride; Poison Oak; Pinworms; and Upcoming Legislation.
Non-metallic Mineral Production Value in Mexico: 2003 In millions of dollars Coke 197 Mineral Coal 183 Salt 84 Flouride 81 Sulphur 73 Gypsum 47 Silice 44 Others 70 Total: US$779 million Note: Table made from pie chart.
(6) It is now known the beneficial effects of systemic fluoride are minor, and topical applications have greater benefit, including flouride that has been systemically absorbed and is then excreted in saliva.
Dental milk, which has flouride added, is now being drunk by 4,568children,out of a population of 25,000 people under- 18 living in Knowsley.