Search results
Results From The WOW.Com Content Network
Fluorine is a chemical element; it has symbol F and atomic number 9. It is the lightest halogen [note 1] and exists at standard conditions as pale yellow diatomic gas. Fluorine is extremely reactive as it reacts with all other elements except for the light inert gases. It is highly toxic.
One third of HF (one sixth of mined fluorine) is used to make synthetic cryolite (sodium hexafluoroaluminate) and aluminium trifluoride. These compounds are used in the electrolysis of aluminium by the Hall–Héroult process. About 23 kg (51 lb) are required for every metric ton of aluminium. These compounds are also used as a flux for glass. [5]
Man-made fluoride compounds are common and are used in medicines, pesticides, and materials. Twenty percent of all commercialized pharmaceuticals contain fluorine, including Lipitor and Prozac. [1] [2] In many contexts, fluorine-containing compounds are harmless or even beneficial to living organisms; in others, they are toxic.
The tea plant (Camellia sinensis L.) is a known accumulator of fluorine compounds, released upon forming infusions such as the common beverage. The fluorine compounds decompose into products including fluoride ions. Fluoride is the most bioavailable form of fluorine, and as such, tea is potentially a vehicle for fluoride dosing. [29]
Fluorine's chemistry is dominated by its strong tendency to gain an electron. It is the most electronegative element and elemental fluorine is a strong oxidant. The removal of an electron from a fluorine atom requires so much energy that no known reagents are known to oxidize fluorine to any positive oxidation state. [20]
Plants of the Bible, Missouri Botanical Garden; Project "Bibelgarten im Karton" (biblical garden in a cardboard box) of a social and therapeutic horticultural group (handicapped persons) named "Flowerpower" from Germany; List of biblical gardens in Europe; Herbermann, Charles, ed. (1913). "Plants in the Bible" . Catholic Encyclopedia. New York ...
Model of the Golden Altar. The incense offering (Hebrew: קְטֹרֶת qəṭōreṯ) in Judaism was related to perfumed offerings on the altar of incense in the time of the Tabernacle and the First and Second Temple period, and was an important component of priestly liturgy in the Temple in Jerusalem.
Moissan's fluorine cell, from his 1887 publication. Fluorine is a relatively new element in human applications. In ancient times, only minor uses of fluorine-containing minerals existed. The industrial use of fluorite, fluorine's source mineral, was first described by early scientist Georgius Agricola in the 16th century, in the context of ...