What is the mass number of a carbon atom that contains 6 protons 8 neutrons 6 electrons?

Mass no. = Protons + Neutrons

Mass no. = 6 + 8

= 14

If you look at the periodic table, you will see that the carbon atom has a mass number of 12. But if you compare with this carbon, it is 14. This is because this carbon atom is an isotope. The isotope is called carbon-14.