What is ATOMIC MASS UNIT?

The standard unit (marked with symbol "u") which indicates the mass on the atomic or molecular scale. It is defined as one twelfth of the mass of neutral atom of carbon-12 in its nuclear and electronic ground state with a value of 1.660538921(73)

ATOMIC MASS UNIT: "Correct symbol for the atomic mass unit is "u" and not "amu"."

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