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OpenStudy (anonymous):
the sum of the protons and neutrons in an atom equals
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OpenStudy (anonymous):
the amtomic mass # i believe
OpenStudy (anonymous):
I'm afraid I have to disagree with the earlier answer. I think you are looking for the mass number. I checked in an online encyclopaedia: http://en.wikipedia.org/wiki/Mass_number
OpenStudy (anonymous):
I think it's tThe mass number of the "element", to be exact because some elements are diatomic meaning they exist in pairs like Oxygen O2, and Hydrogen H2
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