What's the Difference between Mass Number and Atomic Mass?

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To see all my Chemistry videos, check out http://socratic.org/chemistry What's the difference between mass number and atomic mass? Mass number is the number ...

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chemistry, physics, math, khan, academy, brightstorm, ap, ib, honors, sat, oat, dat, mcat, atom, proton, neutron, electron, nucleus, mass, number, atomic, ne...

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