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The mass number of an atom is obtained by totaling the number of _____.
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The mass number of an atom is obtained by totaling the number of _____.

User Simen Echholt
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Add protons and neutrons to get the mass number of an atom
User Srikanth P Vasist
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The mass number of an atom is obtained by totalling the number of protons and neutrons together.
User DDukesterman
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