Democritus, Greek philosopher who proposed atomos, Atomos, Greek word for uncuttable, John Dalton, Proposed atomic theory in 1804, Dalton model, Billiard ball model, J.J. Thomson, Discovered the electron, Plum pudding model, Electrons in positive sphere, Ernest Rutherford, Discovered the nucleus, Gold foil experiment, Tested atom with alpha particles, Rutherford conclusion, Atom is mostly empty space, Nucleus, Small dense positive center, Atom, Smallest particle of an element, Electron cloud, Area surrounding nucleus with electrons, Proton, Positive particle in nucleus, Neutron, Neutral particle in nucleus, Electron, Negative particle with very small mass, amu, Approximate mass of proton or neutron, Atomic number, Number of protons, Mass number, Protons plus neutrons, Isotopes, Same element with different neutrons, Neutral atom, Equal protons and electrons, Alpha particle result, Most passed straight through foil, Deflection, Few alpha particles sharply bounced, Element identity, Determined by proton number, Helium, 2 protons and 2 electrons

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