Define atomic mass unit? Why is it needed.
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An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. ... The AMU is used to express the relative masses of, and thereby differentiate between, various isotopes of elements.
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the mass unit that a atomic structure possess is called atomic mass
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