Democritus: Named the atom , Atomos= uncuttable, Atoms are small bits of matter, 430 B.C, John Dalton: First Atomic Theory , Atoms of the same element are alike. , Atoms of different elements are different. , Compounds , J.J. Thomson: Electrons, Chocolate chip cookie model , , Ernest Rutherford: Protons, Nucleus, Gold Foil Experiment , Niels Bohr: Electrons travel in orbits around nucleus, Each orbit has specific energy level, , Today's Model: Schrodinger, Electron Cloud Model , , Chadwick's neutron ,

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