The History of Elements By SamShadbolt 400 Start of Middle Ages 400 The Start of the Alchemists Sep 12, 1500 End of Middle Ages Sep 19, 1669 Phosphorous by H.Brand Sep 19, 1751 Naming of the Elements Sep 19, 1755 Magnesium by J.Black Sep 19, 1766 Hydrogen Discovered by H. Cavendish Sep 19, 1771 Oxygen by C.W.Scheele Sep 19, 1772 Nitrogen by D.Rutherford Sep 19, 1774 Chlorine by C.W.Scheele Sep 19, 1798 Beryllium by L.N.Vauquelin Sep 19, 1800 Nuclei Atom discovered by Enrico Fermi Sep 19, 1807 Sodium by H.Davy Sep 19, 1807 Potassium by H.Davy Sep 19, 1808 Boron by J.L.Gay-Lussac & L.J.Thénard Sep 19, 1808 Calcium by H.Davy Sep 19, 1817 Lithium by J.A.Arfwedson Sep 19, 1824 Silicon by J.J.Berzelius Sep 19, 1825 Aluminum by H.C.Ørsted Sep 19, 1868 Helium discovered by P.Janssen and J.N.Lockyer Sep 19, 1886 Fluorine by H.Moissan Sep 19, 1893 Neon by W.Ramsay & M.W.Travers Sep 19, 1894 Argon by Lord Rayleigh & W.Ramsay Sep 19, 1897 The Plum Pudding Model was discovered by J.J Thompson Sep 19, 1911 Rutherfords Atom experiment conducted Sep 19, 1913 Niels Bohrers discovers the Orbitals Sep 19, 1940 Element 93 was discovered Sep 19, 1945 Start of the Cold War Sep 19, 1963 End of the Cold War Sep 19, 1997 USA and USSR argue over naming Elements
