What's the Difference between Mass Number and Atomic Mass?
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- Опубликовано: 1 окт 2012
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What's the difference between mass number and atomic mass? Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic mass is the average mass of all the isotopes of a certain type. It is a weighted average that takes into account the abundances of all of the different isotopes.
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Good question! You can look it up in a textbook or on the web, or (usually) it will be given to you in a problem. But the point is, there's no way you can know what the abundance percentages are just off the top of your head, so don't worry if you didn't know where they'd come from.
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