Atomic Theory Timeline By BrittanyMGarcia 300 Democritus Jan 1, 1779 Antoine Lavoiser Jan 1, 1789 Law of Conservation of Mass Jan 1, 1803 Jonh Dalton Jan 1, 1803 Dalton's Atomic Theory suggested the existence of the atom Jan 1, 1869 Dmitri Mendeleev Jan 1, 1879 Cathode Ray Tube Jan 1, 1897 JJ Thomson Jan 1, 1897 Plum Pudding Atomic Model Jan 1, 1909 Robert Millikan Jan 1, 1909 Rutherford Model Jan 1, 1913 Henry Moseley Jan 1, 1922 Bohr Planetary Jan 1, 1922 Niels Bohr developed the Bohr model of the atom. Jan 1, 1926 Gold foil experiment Jan 1, 1926 Erwin Schrodinger Jan 1, 1926 Quantum Mechanical Model Jan 1, 1926 Ernest Rutherford Jan 1, 1932 James Chadwick Jan 1, 1935 Electron Cloud Model
