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The Atomic Theory Timeline 1000 B.C. Alchemists 450 B.C. Democritus 1785 Coulomb: Opposites Attract 1789 Lavoisier: Law of Conservation of Matter 1803 John Dalton: Atoms Cannot be Created, Divided, or Destroyed! 1879 William Crookes: Cathode Ray Tubes 1895 Wilhelm Rontgen: Discovered X-Rays 1896 Becquerel: Discovered Radioactivity 1897 J.J. Thomson: Discovered the Electron 1898 The Curie Family: The "Power-Couple" of Physics and Chemistry 1911 Rutherford: Gold Foil 1900 Max Planck: Quantum Theory 1906 Geiger: The Geiger Counter 1913 Millikan: The Charge of the Electron 1921 Frederick Soddy: Isotopes 1922 Bohr: An Atomic Model 1932 James Chadwick- somehow I assigned this twice... and to whom? Collaborate... 1938 Otto Hahn: Nuclear Fission w/ Lise 1938 Lise Meitner: Nuclear Fission w/ Otto 1951 Glenn T. Seaborg: Periodic Table of the Elements 1962 Leon Lederman: Neutrinos 1969 Gell-Mann/Zweig: Quarks