fluorine

[ floor-een, -in, flawr-, flohr- ]

noun

, Chemistry.

1. the most reactive nonmetallic element, a pale-yellow, corrosive, toxic gas that occurs combined, especially in fluorite, cryolite, phosphate rock, and other minerals. : F; : 18.9984; : 9.

fluorine

/ ˈflʊərɪn; ˈflʊəriːn /

noun

1. 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

fluorine

/ flr′ēn′ /

1. 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.
2. See Periodic Table

Word History and Origins

Origin of fluorine¹

First recorded in 1805–15; fluor(ic) + -ine ¹

Example Sentences

Fifty-two percent of those products contained a high fluorine level, suggesting it contained at least one PFAS.

From Science News For Students

Adding fluorine to fentanyl showed increased opioid activity in the more acidic conditions of injured tissue compared to healthy tissue.

From 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.

From Washington Post

Among over 200 tested beauty products, about half contained high levels of fluorine — a marker for potentially harmful PFAS compounds.

From Science News

Long-lasting or waterproof products were especially likely to contain lots of fluorine.

From Science News

Calcium also occurs, combined with fluorine, in the mineral fluor (CaF2).

From Project Gutenberg

Fluorine is frequently met with as calcium fluoride or fluor-spar (CaF2).

From Project Gutenberg

If the substance contained fluorine, the characters will be found permanently etched on the glass.

From Project Gutenberg

The increase in weight multiplied by 0.655 gives the weight of fluorine.

From Project Gutenberg

The loss in weight gives that of the silicon fluoride (SiF4), which, multiplied by 0.7307, gives the weight of fluorine.

From Project Gutenberg