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Lesson Summary. The atomic mass unit (AMU) is used by scientists to describe the mass of atoms. If you want to convert a mass in grams to AMU, all you need to do is divide by 1.660599 x 10^-24 g/AMU. To unlock this lesson you must be a Study.com Member. Create your account.
So, because most of the hydrogen has a mass of 1 amu, the atomic weight on the periodic table is going to be very close to 1; however, because there is a teeny bit of heavier hydrogen isotopes, the weight represented will be slightly higher than 1 or 1.0079 amu.