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The mass number of an atom is obtained by totaling the number of _____ and _____. electrons and protonselectrons /neutronsprotons and neutrons/ neutrons and isotopes
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The mass number of an atom is obtained by totaling the number of _____ and _____. electrons and protonselectrons /neutronsprotons and neutrons/ neutrons and isotopes

User Gjert
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The mass number of an atom is obtained by totalling up the number of protons and neutrons there are for that atom.
User Brzozow
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