the most reactive nonmetallic element, a pale-yellow, corrosive, toxic gas that occurs combined, especially in fluorite, cryolite, phosphate rock, and other minerals. Symbol: F; atomic weight: 18.9984; atomic number: 9.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use fluorine in a sentence
Fifty-two percent of those products contained a high fluorine level, suggesting it contained at least one PFAS.Lots of makeup may contain potentially harmful ‘forever chemicals’ | Maria Temming | August 13, 2021 | Science News For Students
Adding fluorine to fentanyl showed increased opioid activity in the more acidic conditions of injured tissue compared to healthy tissue.Chemists think they’ve found a way to make opioids less addicting | Purbita Saha | July 17, 2021 | Popular-Science
Over the last three years, researchers tested 231 cosmetics products in North America for fluorine, an indicator of per- and polyfluoroalkyl substances, or PFAS.
Among over 200 tested beauty products, about half contained high levels of fluorine — a marker for potentially harmful PFAS compounds.Many cosmetics contain hidden, potentially dangerous ‘forever chemicals’ | Maria Temming | June 15, 2021 | Science News
Long-lasting or waterproof products were especially likely to contain lots of fluorine.Many cosmetics contain hidden, potentially dangerous ‘forever chemicals’ | Maria Temming | June 15, 2021 | Science News
Calcium also occurs, combined with fluorine, in the mineral fluor (CaF2).
fluorine is frequently met with as calcium fluoride or fluor-spar (CaF2).
If the substance contained fluorine, the characters will be found permanently etched on the glass.
The increase in weight multiplied by 0.655 gives the weight of fluorine.
The loss in weight gives that of the silicon fluoride (SiF4), which, multiplied by 0.7307, gives the weight of fluorine.
British Dictionary definitions for fluorine
a toxic pungent pale yellow gas of the halogen group that is the most electronegative and reactive of all the elements, occurring principally in fluorspar and cryolite: used in the production of uranium, fluorocarbons, and other chemicals. Symbol: F; atomic no: 9; atomic wt: 18.9984032; valency: 1; density: 1.696 kg/m³; relative density: 1.108; freezing pt: –219.62°C; boiling pt: –188.13°C
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for fluorine
A pale-yellow, poisonous, gaseous element of the halogen group. It is highly corrosive and is used to separate certain isotopes of uranium and to make refrigerants and high-temperature plastics. It is also added in fluoride form to the water supply to prevent tooth decay. Atomic number 9; atomic weight 18.9984; melting point -223°C; boiling point -188.14°C; specific gravity of liquid 1.108 (at boiling point); valence 1. See Periodic Table.
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