carbon has 3 isotopes with mass numbers of 12, 13, and 14. what is the difference between these isotopes
Carbon-12 is the most common isotope of carbon. Carbon-14 is radioactive and very rare. Carbon-14; 8 neutrons Carbon-13; 7 neutrons Carbon-12; 6 neutrons The symbols for the isotopes of carbon atoms shown here indicate they each have six protons but mass numbers of 14, 13 and 12. These isotopes are not equally abundant.Carbon-12 (C-12) makes up 98.9 % of all carbon atoms while carbon-13 (C-13) makes up 1.1 %.n example of this is shown with the three different isotopes of carbon. Here they all have 6 protons, but different numbers of neutrons. Carbon-14 has 8 neutrons. Carbon-13 has 7 neutrons and carbon-12 has 6 neutrons.