Properties and data of the isotope 19F.
Fluorine-19 is the only stable isotope of the chemical element fluorine. The atomic nucleus of the nuclide consists of the specific elements 9 protons and 10 neutrons; the sum of the nucleons gives the mass number 19.
19F is a NMR active nucleus and can therefore be measured using NMR spectroscopy for the detection and identification of fluorine-containing compounds. The corresponding analysis technique is fluorine-19 nuclear magnetic resonance spectroscopy (also fluorine NMR or 19F-NMR; see also below).
See also: list of Fluorine isotopes.
Name of the isotope:Fluorine-19; F-19Symbol:19F or 199FMass number A:19 (= number of nucleons)Atomic number Z:9 (= number of protons)Neutrons N:10Isotopic mass:18.998403163(6) u (atomic weight of Fluorine-19)Nuclide mass:18.993466 u (calculated nuclear mass without electrons)Mass excess:-1.48744 MeVMass defect:0.158671285 u (per nucleus)Nuclear binding energy:147.80134995 MeV (per nucleus)
7.77901842 MeV (average binding energy per nucleon)Separation energy:SN = 10.4319(5) MeV (first neutron)
SP = 7.9935998(10) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2+Isobaric spin: 1/2Magnetic dipole moment:μ(μN) = +2.628321(4)Charge radius:2.8976(25) femtometer fmMirror nucleus:Neon-19Year of discovery:1920
Direct parent isotopes are: 19Ne, 19O.
OccurrenceComparison of the natural Fluorine isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| ||Atomic Mass ma||Quantity||Half-life||Spin|
|18.998403163 u||100 %|| || |
|Isotope 19F||18.998403163(6) u||100 %||stable||1/2+|