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Mass number measures... Group of answer choices mass of a single atom's nucleus an average of all isotopes of an element charge of the nucleus mass of several atom's protons
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Mass number measures... Group of answer choices mass of a single atom's nucleus an average of all isotopes of an element charge of the nucleus mass of several atom's protons

User Rulilg
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the mass of a single atom’s nucleus (the mass of its protons and neutrons)
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