Assertion: fluorine's isotope | /r/HasProperty | stable
Facets:
Source sentences:
text: It only has one stable isotope, however, but it can be bonded to other items as well.
text: Fluorine 19, the only stable isotope, has atomic number of 9 and atomic mass of 19, which means it has 9 protons and 9 electrons and 10 neutrons.
text: Fluorine has one stable and naturally occurring isotope, fluorine-19.
text: Fluorine is the lightest of the halogens and has only one stable isotope, F-19.
text: Only one isotope of fluorine is stable (fluorine-19).