What is A?, Proton, Electron, Neutron, What is B?, Proton, Electron, Neutron, What is C?, Proton, Electron, Neutron, What is the charge of a proton?, positive, neutral (no charge), negative, What is the charge of an electron?, positive, neutral (no charge), negative, What is the charge of a neutron?, neutral (no charge), positive, negative, What does the atomic number mean?, the number of protons, the number of electrons, the number of protons and neutrons, What does the mass number mean?, the number of protons, the number of electrons, the number of protons and neutrons

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