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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