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3. why is the average atomic mass in amu(atomic mass unit) of a carbon-12 atom reported as 12.011 instead of 12 on the periodic table of the elements?
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3. why is the average atomic mass in amu(atomic mass unit) of a carbon-12 atom reported as 12.011 instead of 12 on the periodic table of the elements?

User Phillyooo
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We have to take into consideration of the abundances and masses of the two other isotopes.
User Ryan Linton
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