The History of the Atom By Migdog1 Period: 300 to Aug 30, 1940 The History of the Atom 400 Democritis 400 B.C B.C Jan 1, 1803 John Dalton Jan 1, 1896 Henri Becquerel Aug 30, 1897 JJ Thomson Aug 30, 1898 Marie Curie Period: Aug 30, 1901 to Aug 30, 2013 The history of the atom Aug 30, 1909 Robert Millikan Aug 30, 1911 Ernest Rutherford Aug 30, 1922 Neild Bohr Aug 30, 1923 Louis deBroglie Aug 30, 1927 Wener Heisenberg Aug 30, 1930 Erwin Schrodinger Aug 30, 1932 James Chadwick