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Atomic mass
01
the weighted average mass of an atom of an element, taking into account the masses of all its naturally occurring isotopes
Example
The atomic mass of carbon is approximately 12.01 because it averages the masses of carbon-12 and carbon-13 isotopes.
Hydrogen has an atomic mass of about 1.01, reflecting the presence of both protium and deuterium isotopes.
The periodic table lists the atomic mass of oxygen as 16.00, considering its common isotopes.
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