definition of "nuclide" I apologize to all the hardened physicists out there. I have a trivial question. What is the exact definition of the term "nuclide." The problem is that I see it bouced around and used different ways that seem to conflict. Also, I see it being used synonymously as other words. The way I see it used most often makes me think that it is simply a synonym for "isotope." I also get the impression that the only difference between the two is sort of grammatical. For instance you would say "Fluorine-19 is the only known isotope of that element. It is its only nuclide." The only difference here is that "isotope" is followed by "of." Please help me. I know this sounds stupid but knowing the precise definition might help me grade some freshman chemistry exams.