Nucleus - Contains protons and neutrons, Proton - Positively charged, found in nucleus, Electron - Negatively charged, found in shells, Neutron - Neutral, found in nucleus, Mass number - = protons + neutrons, 1st Shell - Holds up to 2 electrons, 2nd Shell - Holds up to 8 electrons, Atomic (proton) number - = protons (also equal to electrons), Neutron number - = mass number - atomic number, Isotope - same number of protons, different neutrons,

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