Atomic Number, The number of Protons in the nucleus of an atom., Mass Number, The number of protons + neutrons, Nucleus, Contains protons and neutrons, Proton, Has a charge of +1 and relative mass of 1, Neutron, Has a charge of 0 and relative mass of 1, Electron, Has a charge of -1 and relative mass of 1/1840, If an neutral atom has 3 protons, It has 3 electrons

Atomic Structure

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