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Physics 14 Online
OpenStudy (anonymous):

The mass number of an element is the number of protons plus electrons number of protons only number of protons plus neutrons

OpenStudy (shane_b):

The atomic mass number is the sum of the protons and neutrons. You can read more about this type of stuff here. http://www.wisc-online.com/objects/ViewObject.aspx?ID=GCH3404

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