Atomic Theory By reneepaguaga Oct 6, 1803 John Dalton Sep 6, 1879 William Crooke Sep 6, 1897 J.J. Thomson Sep 6, 1900 Ernest Rutherford Aug 29, 1932 James Chadwick James was most famous for his discovery of the neutron in an atom.Which took place in 1932. Aug 29, 1963 Niels Bohr
