definition of atomic mass unit
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a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.
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Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible. The second part of the theory says all atoms of a given element are identical in mass and properties.
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