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Atomic mass is the mass of a single atom of an element, measured in atomic mass units (u), where 1 u = 1⁄12 the mass of a carbon-12 atom. It represents the average mass of all naturally occurring isotopes of the element. Example: The atomic mass of oxygen is 16.00 u, which is the weighted average of its isotopes (mainly O-16, O-17, and O-18).
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Technocrats Institute of Technology & Science, Bhopal