Organization of the Periodic Table By tcottman Jan 1, 1766 Henry Cavendish identifies Hydrogen Jan 1, 1789 Antoine Lavoisier lists comprehensive list of 33 elements & distinguishes between metals & non-metals Jan 1, 1828 Johann Dobereiner developed groups of 3 elements with similar properties Jan 1, 1828 Jakob Berzelius developed a table of atomic weights and assigns letters Jan 1, 1864 John Newlands arranged known elements in order of atomic weights Jan 1, 1864 Lothar Meyer develops early version of periodic table - 28 elements included Jan 1, 1864 Dmitri Mendeleev created table by atomic weight arranged periodically by elements with similar properties Jan 1, 1894 William Ramsay discovers Noble Gasses Jan 1, 1898 Marie and Pierre Curie identify radium and polonium Jan 1, 1900 Ernest Rutherford discovered source of radioactivity is decaying atoms Jan 1, 1913 Henry Moseley determines atomic number of each element and adjust periodic law Jan 1, 1940 Edwin McMillan and Philip H. Abelson identify neptunium Jan 1, 1940 Glenn Seaborg synthesised transuranic elements
