Fluori

Kemiallinen merkki: F
Järjestysluku: 9
Kategoria: halogeenit
Ryhmä: 17
Jakso: 2
Lohko: p
Moolimassa: 18,9984032 g/mol
Elektronia kuorilla: 2, 7
CAS-numero: 7782-41-4
Olomuoto: kaasu
Tiheys: 1,7 g/l (0 °C, 101,325 kPa)
Sulamispiste: 53,53 K (-219,62 °C, -363,32 °F)
Kiehumispiste: 85,03 K (-188,12 °C, -306,62 °F)
Kiderakenne: cubic
Hapetusluvut: -1
Elektronegatiivisuus: 3,98 (Pauling-asteikko)
Nimen alkuperä: fluere
Nimen tarkoitus: a Latin word which means 'to flow' - fluorine was used as a flux which promotes the flow of molten metals
Faktoja:
- forms a single bond with itself in elemental form, resulting in the diatomic F2 molecule
- is a supremely reactive, poisonous, pale, yellowish brown gas
- is the most chemically reactive and electro- negative of all the elements
- is highly dangerous because it readily burns hydrocarbons, more so than other halogens such as the poisonous chlorine gas
- though F2 is too reactive to have any natural biological role, fluorine is incorporated into compounds with biologic
- is not an essential nutrient, but its important in preventing tooth decay is well-recognized, and thus used in tooth pastes
- has a characteristic pungent odor that is detectable in concentrations as low as 20 ppb
- the lethal dose of sodium fluoride in rats is 52 mg/kg