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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 is the average atomic mass of neon. Letâs just take a second and see if 20.18 amu seems like a reasonable answer, given the initial data. According to the table, most neon (over 90%) has a mass of approximately 20 amu, a tiny bit has a mass of around 21 amu, and around 9% has a mass of 22 amu.