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Carbon (symbol C, atom number 6) is build up with:

6 protons, 6 electrons and 6 or 7 or 8 neutrons, depending on the mass number of the three possible natural isotopes: C-(12) has 6 neutrons and C-(13) or (14) has 7 or 8 of them respectively.

All the carbon isotopes have 6 electrons and protons; the number of neutrons is different for each isotope:

Number of neutrons in a carbon isotope=Atomic weight of the isotope (rounded) - 6

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14y ago

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