what is atomic mass unit
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atomic mass unit also known as atomic unit is 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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An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. For example, one atom of helium-4 has a mass of 4.0026 amu
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