Fluorine Atomic Mass

Atomic Structure Fluorine

Isotope	Atomic mass (Da)	Isotopic abundance (amount fraction)
¹⁹F	18.998 403 163(6)	1

Atomic mass (Da) Isotopic abundance (amount fraction) 19 F. 18.998 403 163 (6) 1. Fluorine is a monoisotopic element and its atomic weight is determined solely by its isotope 19 F. The Commission last revised the standard atomic weight of fluorine in 2013. Fluorine-18 atom is the radioactive isotope of fluorine with relative atomic mass 18.000938. The longest-lived fluorine radionuclide with half-life of 109.77 min. Sources of Fluorine: Found in the minerals fluorite (CaF 2 ) and cryolite (Na 2 AlF 6 ). Around 2,400 tons of fluorine gas and 4,700,000 tons of fluorite are produced each year.

Fluorine is a monoisotopic element and its atomic weight is determined solely by its isotope ¹⁹F. The Commission last revised the standard atomic weight of fluorine in 2013 based on the latest Atomic Mass Evaluation by IUPAP.

SOURCEAtomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
© IUPAC 2003

CIAAW

Fluorine Atomic Mass Unit

Fluorine
A_r(F) = 18.998 403 163(6) since 2013
The name derives from the Latin fluere for 'flow' or 'flux' because fluorite (CaF₂) was used as a fluxin metallurgy owing to its low melting point. It was discovered in hydrofluoric acid by the Swedishpharmacist and chemist Carl-Wilhelm Scheele in 1771, but it was not isolated until 1886 by the Frenchpharmacist and chemist Henri Moissan.