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On the Periodic Table each element will have 2 numbers. One will be a whole number going from 1 hydrogen to 113 or so. This is the atomic number which is the number of protons it has. There will also be a number with a few decimal places. Carbon has a atomic number of 6 (as it is element number 6 and has 6 protons.) and an Atomic Mass of 12.011. The atomic mass is the average mass of a an atom for Carbon 99% of the atoms have a mass 12 (6 protons and 6 neutrons) and 1% has a mass of 13 the average of the two (0.99 X 12) + (0.01 X 13) = 12.011

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