![]() The relative atomic masses given in periodic table entries-like the one for hydrogen, below-are calculated for all the naturally occurring isotopes of each element, weighted by the abundance of those isotopes on earth. ![]() Relative Atomic Mass an average of the atomic masses of all the different isotopes in a sample, with each isotope's contribution to the average determined by how big a fraction of the sample it makes up. In general, an atom's atomic mass will be very close to its mass number, but will have some deviation in the decimal places. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu. Atomic Mass The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu.
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