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ATOMIC THEORY John Dalton-Atomic Theory All atoms of a given element are identical Atoms of different elements have different masses A compound is a specific combination of atoms of more than one element In a chemical reaction atoms are not created nor destroyed; they exchange partners to produce new substances J.J. Thomson – Cathode Rays Discovered 1st subatomic particle Plum Pudding Model - Thomson Atom made of jelly-like substance that is positively charged. Electrons spread throughout jelly-like material. Gold Foil Experiment - Rutherford Periodic Table Periodic Table