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OpenStudy (anonymous):
What is the mass number of an atom?
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OpenStudy (anonymous):
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. Because protons and neutrons both are baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion.
OpenStudy (kaederfds):
Mr
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