Hoyo-SHEEHAN-PER.3 By sheehan3 400 Democritus 500 Aristotle 500-400 B.C. Greece Matter was created by four elements, earth, wind, fire, and water Oct 10, 1803 John Dalton Oct 9, 1896 Henri Becquerel Oct 10, 1897 J.J. Thomson discovered the electron Oct 9, 1898 Marie and Pierre curie Oct 10, 1909 Robert Millikan Oct 10, 1911 Ernest Rutherford Oct 11, 1913 quantum model Oct 9, 1930 Neils Bohr Oct 9, 1932 James Chadwick doscovered the nucleus
