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Mathematics 15 Online
OpenStudy (anonymous):

An isotope's mass number is the number of / protons and electrons / protons only / neutrons only / protons and neutrons

thomaster (thomaster):

Post this in the physics group, not mathematics

OpenStudy (anonymous):

mass of an isotope depends on the subatomic particles present in the nucleus.. (you should post it to the chem/physics forum)

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