Sciense By chuberg45 400 Democritus Jan 1, 1803 John Dalton Dalton Proposed the theory that all matter is made up of individual particles called atoms, which cannot be divided. Jan 1, 1897 J.J. Thompsan ( Plum Puding ) J.J. Thompsan descovered the electron in 1897 Jan 1, 1904 Hantaro Nagaoka Jan 1, 1911 Ernest Rutherford Jan 1, 1913 Bohr Model Jan 1, 1932 James Chadwick
