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See the Web Links for "Answers.com: Atomic Mass" to the bottom for the answer. Atomic mass refers to the weight of an atom when compared to aribitary figure that is relative to other atoms.
The unit used is 1/12 the weight of a carbon atom (the most prolific around). Atomic mass is used to avoid using very small numbers that would otherwise result if you try to physically weigh an atom.

Note that atomic mass is not the same thing as atomic weight. See the Related Question to the left for more information.

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Q: What is the atomic mass?
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