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OpenStudy (anonymous):
The sum of the protons and neutrons in an atom equals the A. atomic number. B. number of electrons. C. atomic mass. D. mass number.
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OpenStudy (anonymous):
It is d.
OpenStudy (anonymous):
A= Atomic number is Proton number So its also incorrect . B= is incorrect D= http://en.wikipedia.org/wiki/Mass_number (Correct) C= http://en.wikipedia.org/wiki/Atomic_mass
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