STUDENTS:
This VIDEO has a broad discussion of the role of mass in our models of the atom: protons, neutrons, atomic mass units, mass numbers, isotopes, the negligibiliy of the electron's mass and mass weighting problems.
It also points out the interesting fact that both the periodic table and the metric system have been "tinkered" with so that the numbers in the periodic table can be interpreted either in terms of amu (atomic masses) or grams per mole (molar masses) . . . very clever, and very useful:
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