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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.
This unit is actually not the mass of a proton or neutron in grams but is a mass ratio based on the element carbon. An amu is defined as 1/12 of the mass of a carbon atom. Proton...Protons have a positive charge. The number of protons in a nucleus determines the identity of the atom (element) and this number is called the atomic number. The actual mass of a proton has been determined to be 1.673 x 10-24 gram. Scientists use the metric system of measurement where the standard unit for mass is the gram.