Chemistry timeline By albertoAC Jan 15, 1662 Boyle Marotte's law is published Jan 15, 1702 Gay Lussac's Law is published Jan 15, 1801 Charles' law is published Mar 17, 1803 Dalton's Atomic Theory Jan 15, 1811 Avogadro's law is published Jul 16, 1897 J.J. Thompson discovers the electron He used a cathode ray tube and 2 electromagnets to determine the charge of the unknown subatomic particle. Jan 13, 1904 J.J. Thompson states his Plum Puddinng atomic model Jan 13, 1911 Ernest Rutherford performs the Rutherford experiment He discovers that the positive matter is in a very small dense nucleus and that most of the atom is empty space Jan 15, 1913 Niels Bohr states his postulate of the electron shells which explain the change in the spectra of the atoms Jan 15, 1924 Wave-particle duality by Louis de Broglie Jan 15, 1927 The Uncertainty Principle of Heisenberg