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QUESTION

# A carbon isotope consists of 6 protons, 6 electrons and 8 neutrons, what is the mass number?

The is 14.

Since the mass number is simply the number of protons added with the number of neutrons, you would add 6 to 8 to get 14. Electrons are irrelevant in the calculation.

P.S. The mass number can also distinguish for , in this case a mass number of 14 means that this carbon isotope is known as "Carbon"-14.

The most common isotope of carbon is "Carbon"-12 and has 6 protons and 6 neutrons.