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Relative atomic mass or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant is defined as being 1/12 of the mass of a carbon-12 atom.
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RELATIVE ATOMIC MASS
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It is average mass of one atoms of an element relative to the mass of one atom of C-12 .
it is a relative mass .
Mass of one atom of C-12 is taken as the standard . it shows how heavy is an atom of an elements as compared to another atom of an element since it is a ratio between masses atoms so it has no specific units . Generally it is expressed in atomic mass unit (a.m.u)

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