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Question

What does 12C mean in amu?

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Solution

An atomic mass unit (symbolized AMU or a.m.u) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (12C) atom has six protons and six neutrons in its nucleus. In imprecise terms, one AMU is the average of the proton rest mass and the neutron rest mass.

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