Posted by Jillian on Saturday, April 4, 2009 at 10:50am.
Try some of the following Search:
http://www.google.com/search?q=average+mass+of+the+mixture+of+an+element%27s+isotopes&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Sra
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