define atomic mass unit .
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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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An atomic unit of mass is defined as accurately 1/12 the mass of a carbon-12 atom. The carbon-12 atom has six neutrons and six protons in its nucleus. The atomic unit mass is symbolized as AMU or amu.
1 AMU = Average of the proton rest mass and the neutron rest mass.
1 AMU = 1.67377 x 10 -27 kilogram or 1.67377 x 10 -24 gram.
Explanation:
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