DEMOCRITUS, Greek philosopher, Came up with the idea of "atoms", Said universe was made of atoms that were "uncuttable", Had no evidence for his ideas, DALTON, Thought elements could join together to form compounds, Thought all atoms of same element were exactly the same, Law of definite proportions, Credited with first atomic theory (both right and wrong), THOMSON, Cathode-ray experiment, Discovered electrons, plum pudding model of atom, RUTHERFORD, Discovered the nucleus of atoms, Discovered protons (+) and neutrons (=), BOHR, Thought atoms were mostly empty space., Said exact locations of electrons was difficult to determine, Came up with orbital/electron clouds

ATOMIC THEORY

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