Democritus: "Atomos", , Indivisible (400 BCE), Dalton: Billiard Ball Model, Atoms unique to each element, Indivisible (1800s), Thomson: Plum Pudding Model, , Electrons, Rutherford: Nuclear Model, , Electrons, Nucleus, Bohr: Planetary Model, , Electrons, Nucleus, Orbits, Quantum Wave Theory: Quantum Mechanical Model, , Electrons, Nucleus, Electron Cloud,

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