How many neutrons are in the Isotopes...?

Each element has its number of neutrons, an isotope is basically the same element but with a different neutron count, so lets say F which is fluorine and has 9 neutrons (i hope you know how to get the neutrons) so F 23 (23 being the number of added protons and neutrons) so you subtract the protons, fluorine has 9 protons so 23-9= 14 so there are 14 neutrons in that isotope.