fluorine

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

Phonetic (Standard)IPA

noun

, Chemistry.

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

/ ˈflʊəriːn; ˈflʊərɪn /

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′ /

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

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

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.

Browse