Isotopes of Fluorine

Isotopes Of Fluorine

Although fluorine (F) has 18 known isotopes from 14F to 31F and one isomer (18mF), only one of these isotopes is stable, that is, fluorine-19; as such, it is a monoisotopic element. The longest-lived radioisotope is 18F with a half-life of 109.771 minutes. All other isotopes have half-lives under a minute, the majority under a second, making fluorine a mononuclidic element as well. The least stable isotope is 15F, whose half-life is 4.1 x 10−22 seconds, corresponding to a spectral linewidth of about 1 MeV. Only 14F has an unknown half-life.

Standard atomic mass: 18.9984032(5) u