The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope.

Name: The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope.
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The atomic weight is a weighted average of the masses of all the isotopes of an element, reflecting their natural abundance, and can differ from the mass of any single isotope.

The Atomic Weight Is Only an Average of Relative Weights