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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