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Chemistry, 03.02.2021 17:50 isalita

The mass number of an atom is determined by ___. 1.adding the protons and electrons
2.adding the protons and neutrons
3.adding the electrons and neutrons
4. adding the protons, electrons and neutrons

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The mass number of an atom is determined by ___. 1.adding the protons and electrons
2.adding...

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