Define the atomic mass unit .
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atomic mass unit. A unit of mass equal to 112 the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12 and has a value of 1.660 X 10-24 grams.
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Atomic mass unit (also known AMU or amu) is defined as 1/12 of the mass of an atom of carbon-12 (C-12). The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. ... The mass of an atom in AMU is roughly equal to the sum of the number of protons and neutrons in the nucleus.
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