Atomic Mass Unit (Dalton)
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PHYSICS
Atomic Physics
Atomic Mass Unit (Dalton)
Dalton unit standardizes atomic mass as one-twelfth of carbon-12 atom's mass
31 Jan 2026
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Why is the atomic mass unit defined as one-twelfth of the mass of a carbon-12 atom?
Because carbon-12 is the heaviest naturally occurring isotope.
Because carbon-12 provides a stable and universally accepted reference for atomic mass measurements.
Because one-twelfth of any atom's mass is easier to measure than the whole atom's mass.
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