Democritus - Proposed idea of atoms in 4th Century B.C., Dalton - Atomic theory, Plum Pudding Model - Model showing electrons in an atom, Gold Foil Experiment - Led to discovery of the nucleus, JJ Thomson - Discovered electron, Negative - Charge of an electron, Positive - Exact charge of nucleus, Rutherford - Discovered nucleus (gold foil experiment), Cathode Ray Tube Experiment - Led to the discovery of an electron, Aristotle - 4 Elements (water, air, earth, fire), Law of Definite Proportions - Water always is in a 2:1 ratio, Neutral - Charge of an atom, Alpha Particles - Fast moving radioactive particles (+ charged), Atomos - Means indivisible, Atom - Building block of all matter,

Atomic Theory Scientists

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