Chemistry Key Definitions

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Relative atomic mass (Ar)

Is the weighted mean mass of an atom of an element compared with one twelth of the mass of the atom carbon-12

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Relative Isotopic Mass

Is the mass of an atom of an isotope compared with one twelth of the mass of an atom carbon-12

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Relative Molecular Mass

The relative molecular mass is the weighted mean mass of a molecule compared with on twelth of the mass of an atom of carbon-12.

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