The correct answer is 1/12 the mass of an atom of carbon-12
What is atomic mass unit ?
One atomic mass unit is defined as a mass exactly equal to one-twelfth the mass of one carbon-12 atom.
what is Carbon-12?
Carbon-12 is the carbon isotope that has six protons and six neutrons. Setting the atomic mass of carbon-12 at 12 atomic mass unit provides the standard for measuring the atomic mass of the other elements.
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