Encyclopedia of Geochemistry

Editors: William M. White

Fluorine

Living reference work entry
DOI: https://doi.org/10.1007/978-3-319-39193-9_102-1

Element Data

Atomic symbol: F

Atomic number: 9

Atomic weight: 18.998 g/mol

Isotopes and abundances: 19F 100 %

1 Atm melting point: −219.67 °C

1 Atm boiling point: −188.11 °C

Common valences: −1

Ionic radii: 130 (III), 131 (IV), and 133 (VI), in pm (coordination number)

Pauling electronegativity: 3.98

First ionization potential: 17.4428 eV

Chondritic (CI) abundance: 60.7 μg.g−1

Silicate earth abundance: two estimates – 18 ± 8 and 25 ± 10 μg.g−1

Continental crust abundance ~ 550 μg.g−1

Oceanic crust abundance 130 ~ 1000 (est. 400) μg.g−1

Seawater abundance: 1.3 μg.g−1

Core abundance: considered as 0

Properties

In its elemental form, fluorine exists as a diatomic molecule of highly toxic, corrosive, pale yellow gas with a pungent smell in ambient conditions. As the most electronegative element, fluorine is reactive and commonly found in nature as ionic compounds bonded to metal cations or hydrogen. Fluorine can dissolve into solution forming F ions.

History and Use

Fluorite (CaF2) has...

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Laboratoire Magmas et VolcansUniversité Blaise Pascal – CNRSClermont-FerrandFrance