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   ocr: Atomic mass THE TOTAL number ofprotons and neutrons in the nucleus of each atom ofan element THE MASS ofan atom 1S concentratedin its nucleus (center), which is made upof protons and neutrons. An individual atom ofan element cannot be weighed, butits mass can be compared - - to that ofa carbon atom, which is chosen as the standard. Thisis calledits relative atomic mass.