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(D) The mass of an atom or a molecule is extremely small. To express these masses conveniently,a standard unit is required.Historically,the 'atomic ma

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atomic mass unit

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(D) The mass of an atom or a molecule is extremely small. To express these masses conveniently,a standard unit is required.Historically,the 'atomic mass unit' $(amu)$ was used,which is now represented by the unified mass unit $(u)$.This unit is defined as exactly $1/12$th of the mass of one carbon-$12$ atom.Therefore,the accepted unit for measuring the mass of an atom and a molecule is the atomic mass unit ($amu$ or $u$).

The unit accepted for measuring the mass of an atom and a molecule is

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