Democritus - Indivisible (atomos), Dalton - Indivisible / "solid sphere" or "billiard ball" model, Thomson - Discovered electrons / "Plum Pudding" model, Rutherford - Dense inner nucleus with discovery of protons / "Nuclear" model, Bohr - Discovered orbitals (where specific numbers of electrons can be found) / "Planetary" model, Chadwick - Discovered neutrons / "Planetary" model, Crookes - Created a tube experiment which showed atoms could give off or have smaller particles,

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