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Science glossary film: Atomic weight

Atomic weight

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The average mass of atoms of an element.

The average mass of atoms of an element. Whereas atomic mass refers to atoms of a particular isotope, atomic weight refers to an average mass of the different isotopes of an element. Unlike atomic mass, atomic weight can vary from one sample of an element to another as the ratio of its isotopes varies.

Whereas atomic mass refers to atoms of a particular isotope, atomic weight refers to an average mass of the different isotopes of an element. Unlike atomic mass, atomic weight can vary from one sample of an element to another as the ratio of its isotopes varies.

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