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OpenStudy (anonymous):
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OpenStudy (anonymous):
The mass number of an atom is 10. It has 4 protons, 4 electrons and 2 neutrons. 10 protons. 10 neutrons. 5 neutrons and 5 protons
OpenStudy (aaronq):
the mass number is the sum of the atomic number (# of protons) and the number of neutrons
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