Article
Article
Fluorine
Article By:
Sheft, Irving Chemistry Division, Argonne National Laboratory, Argonne, Illinois.
Rao, V. N. M. Dupont Central Research and Development, Wilmington, Delaware.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.263700
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A chemical element, F, atomic number 9, atomic weight 18.998. Fluorine, a Group 17 element, is the member of the halogen family that has the lowest atomic number and atomic weight. Although only the isotope with atomic weight 19 is stable, the other, radioactive isotopes between atomic weight 17 and 22 have been artificially prepared. Fluorine is the most electronegative element, and by a substantial margin the most chemically energetic of the nonmetallic elements. See also: Electronegativity; Halogen elements; Periodic table
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