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a salt of hydrofluoric acid; see hydrogen fluoridehydrogen fluoride,
chemical compound, HF, a colorless, fuming liquid or colorless gas that boils at 19.54°C;. It is miscible with water and is soluble in benzene, toluene, and concentrated sulfuric acid.
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. See also fluoridationfluoridation
, process of adding a fluoride to the water supply of a community to preserve the teeth of the inhabitants. Tooth enamel ordinarily contains small amounts of fluorides and when the amount is augmented through the intake of fluoridated water, especially during the
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; fluorinefluorine
, gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6°C;; b.p. −188.14°C;; density 1.696 grams per liter at STP; valence −1. Fluorine is a yellowish, poisonous, highly corrosive gas.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
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 It might be outdated or ideologically biased.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
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The addition explained that local substitution for liquid hydrogen fluoride is already underway and that there was greater need to find a substitute for gas hydrogen fluoride, for which Korea has greater dependency from overseas suppliers.
Another paper in 2014 claimed that fluoride as a neurotoxin could affect the development of babies.
'Excessive ingestion of fluoride can lead to dental fluorosis and other adverse health effects.
Dentists generally recommend fluoride for cavity fighting, but even some of them continue to believe that the mechanics of wiping your teeth clean of plaque also reduces cavities.
Fluoride helps in demineralization of dental enamel by being adsorbed at the tooth enamel surface and thus decreasing its solubility in acids [21].
Levels of fluoride in drinking water are routinely monitored and controlled at treatment works in developed countries.
Therefore, when a child was examined at school age, his or her current exposure to fluoride in water likely matched his or her prenatal exposures.
The aim of this study is to evaluate the occurrence of dental fluorosis in children of Avarankattur village in Pappireddipatti block of Dharmapuri district and correlating it with fluoride content of drinking water and other related factors.
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First, evidence from histological, chemical and molecular studies has established that the relationship between fluoride and impaired brain function is biologically plausible.
Gupta and Ayoob apply the principles and methods of environmental engineering to the geo-genic pollution of drinking water with fluoride They cover a global perspective on fluoride in drinking water, a scenario of fluoride pollution, dental fluorosis, skeletal fluorosis, stress effects of fluoride on humans, fluoride in the environment and its toxicological effects, an overview of defluoridation techniques, and a case study of the adsorptive removal of fluoride.
For consumers that prefer toothpaste without fluoride and SLS, hello's fluoride-free SKUs for kids and adults are made with aloe vera, erythritol and xylitol.