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      [Noun]  | "atomic mass" 


      1: the mass of an atom usually expressed in atomic mass units; also : atomic weight


      Origin: 1848 ;

      [Noun]  | "atomic mass unit" 


      1: a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the mass of a single atom of the most abundant carbon isotope 12C —called also dalton


      Origin: circa 1942 ;

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       [ "average atomic mass" ]

      1: The weighted average of the atmoic masses of the naturally occuring isotopes of an element.

        * e.g.,  ... Suppose you had a box of marbles that contain 2 sizes of marbles. If 25% of the marbles have the massses of 00g each and 75% have the masses of 00g each then the average atomic mass would look like this. 

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