Protons, These have a mass of 1 and and charge of +1, Electron, The negative subatomic particle, Neutrons, Neutral in charge and in the nucleus, Isotopes, Different versions of the same element, Nucleus, Where the mass of an atom is concentrated, Shells, Where electrons are found, Dalton, Considered atoms to be solid spheres , Thompson, Developed the plum pudding model of the atom, Rutherford, Carried out the gold foil experiment, Bohr, Led to the development of the planetary model of the atom, Chadwick, Discovered the existence of neutrons.

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