Average Atomic Mass
of atomic mass (and for unstable isotopes, radioactivity). Therefore, the periodic table lists a weighted average atomic mass for each element. In order to calculate this quantity, the natural abundance and atomic mass of each isotope must be provided. •N16. Consider the individual atomic masses for magnesium isotopes given in Model 2. a.
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www.npsd.k12.nj.usThe masses on the periodic table are the average mass of all isotopes and their abundances found in the universe. Although carbon-12 weighs exactly 12 amu, the ... atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu.