Atomic masses L.O.: Define the terms relative isotopic mass and relative atomic mass, based on the 12C scale; Calculate the relative atomic mass of. - ppt download
Carbon-12 scale
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Atomic mass - Wikipedia
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carbon12_14.png
One atomic mass unit is defined as one twelfth of the mass of one carbon - 12 atom.
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Why Carbon 12 is Taken as Standard || Why Carbon is Important – Chemistry Page