Dalton, Atom was indivisible/uncuttable., Atoms of a given element are identical., Solid Sphere Model, Thomson, Experimented using the cathode ray., Discovered the electron., Plum Pudding Model, Rutherford, He experimented using Gold Foil, Discovered the positively charged nucleus, Nuclear Model, Bohr, Electrons have a fixed amount of energy in an orbit., Electron in an orbit close to the nucleus are on their lower energy state., Planetary Model, Schrödinger and more, Electrons are not in levels. They are in a cloud around the nucleus., The electron cloud shows possible locations that electrons could be in., Quantum Model/Electron Cloud Model

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