define the 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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Explanation:
It is defined as the mass unit equal to exactly one - twelth (1/12th) of the mass of one atom of carbon -12. It is i denoted by (u) i.e. 1u=1.66×10-24g.
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