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slightly more than 14, carbon 12 has an Atomic Mass of 12 by definition, so 1 atomic mass = the sum of the mass of a proton neutron and electron divided by 2

neutrons are slightly heavier than the combined mass of an electron and proton carbon 14 has a higher percentage neutrons than carbon 12 so it is heavier relative to the number of particles in it's nucleus(14)

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14y ago

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