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Unrecorded discoveries

Unrecorded discoveries. Oldest existing sample. Earliest use. Element. Copper 9000 BC 6000 BC. Lead 7000 BC 3800 BC. Gold Before 6000 BC 3000 BC.

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Unrecorded discoveries

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  1. Unrecorded discoveries Oldest existing sample Earliest use Element Copper 9000 BC 6000 BC Lead 7000 BC 3800 BC Gold Before 6000 BC 3000 BC Silver Before 5000 BC 4000 BC Carbon 3750 BC Antimony 3000 BC Tin 3500 BC 2000 BC Arsenic 2500 BC/1250 AD Mercury Before 2000 BC 1500 BC Sulphur Before 2000 BC Zinc Before 1000 BC 1000 BC

  2. Chromium Before 1 AD Before 1 AD Recorded Discoveries Widely known Predictor Element Predicted Phosphorus 1669 1669 H. Brand Cobalt 1732 1732 G. Brandt Platinum 1735 1735 A. de Ulloa Nickel 1751 1751 F. Cronstedt Bismuth 1753 1753 C.F. Geoffroy Magnesium 1755 1808 J. Black Hydrogen 1766 1766 H. Cavendish Oxygen 1771 1771 W. Scheele Nitrogen 1772 1772 D. Rutherford Chlorine 1774 1774 W. Scheele Manganese 1774 1774 W. Scheele Barium 1772 1808 W. Scheele Molybdenum 1778 1781 W. Scheele Tellurium 1782 1782 F.-J.M. von Reichenstein

  3. Widely known Element Predicted Predictor Tungsten 1781 1783 T. Bergman Strontium 1808 1808 W. Cruikshank Zirconium 1789 1824 H. Klaproth Uranium 1789 1841 H. Klaproth Titanium 1791 1825 W. Gregor Yttrium 1794 1840 J. Gadolin Vanadium 1801 1830 M. del Río Niobium 1801 1864 C. Hatchett Tantalum 1802 1802 G. Ekeberg Palladium 1803 1803 H. Wollaston Cerium 1803 1839 H. Klaproth, J. Berzelius,and W. Hisinger Osmium 1803 1803 S. Tennant Iridium 1803 1803 S. Tennant Rhodium 1804 1804 H. Wollaston Potassium 1807 1807 H. Davy

  4. Widely known Element Predicted Predictor Sodium 1807 1807 H. Davy Calcium 1808 1808 H. Davy Boron 1808 1808 Gay-Lussac and L.J. Thénard Fluorine 1810 1886 A.-M. Ampère Iodine 1811 1811 B. Courtois Lithium 1817 1821 A. Arfwedson Cadmium 1817 1817 S. L Hermann, F. Stromeyer, and J.C.H. Rolof Selenium 1817 1817 J. Berzelius and G. Gahn Silicon 1824 1824 J. Berzelius Aluminium 1825 1825 H.C.Orsted Bromine 1825 1825 J. Balard and L. Gmelin Thorium 1829 1829 J. Berzelius Lanthanum 1838 1838 G. Mosander

  5. Widely known Element Predicted Predictor Erbium 1842 1842 G. Mosander Terbium 1842 1842 G. Mosander Ruthenium 1807 1844 J. Sniadecki Caesium 1860 1882 R. Bunsen and R. Kirchhoff Rubidium 1861 1861 R. Bunsen and G. R. Kirchhoff Thallium 1861 1862 W. Crookes Indium 1863 1867 F. Reich and T. Richter Helium 1868 1895 P. Janssen and N. Lockyer Gallium 1875 1875 P. E. L. de Boisbaudran Ytterbium 1878 1907 J.C.G. de Marignac Holmium 1878 1878 M. Delafontaine Scandium 1879 1879 F. Nilson Samarium 1879 1879 P.E.L. de Boisbaudran Gadolinium 1880 1886 J. C. G. de Marignac Praseodymium 1885 1885 A. von Welsbach Neodymium 1885 1885 A. von Welsbach Dysprosium 1886 1886 P.E.L. de Boisbaudran

  6. Widely known Element Predicted Predictor Germanium 1886 1886 A. Winkler Argon 1894 1894 Lord Rayleigh and W. Ramsay Krypton 1898 1898 W. Ramsay and W. Travers Neon 1898 1898 W. Ramsay and W. Travers Xenon 1898 1898 W. Ramsay and W. Travers Polonium 1898 1902 P. and M. Curie Radium 1898 1902 P. and M. Curie Radon 1898 1910 E. Dorn Actinium 1899 1899 A.-L. Debierne Europium 1896 1901 E.-A.Demarçay Lutetium 1906 1906 G. Urbain and C.A. von Welsbach Rhenium 1908 1908 M. Ogawa Hafnium 1911 1922 G. Urbain and V. Vernadsky Protactinium 1913 1913 O.H.Göhring and K. Fajans Technetium 1937 1937 C. Perrier and E. Segrè Francium 1939 1939 M. Perey Astatine 1940 1940 R. Corson, R. Mackenzie and E. Segrè Neptunium 1940 1940 E.M. McMillan and H. Abelson

  7. Widely known Element Predicted Predictor Glenn T. Seaborg, Arthur C. Wahl, W. Kennedy and E.M. McMillan Plutonium 1940–1941 1940-1941 Americium 1944 1944 Curium 1944 1944 Promethium 1942 1945 S. Wu, E.G. Segrè and A. Bethe Berkelium 1949 1949 G. T. Seaborg, A. James, O. Morgan and A. Ghiorso G. T. Seaborg, R. A. James and A. Ghiorso Thompson, A. Ghiorso and G. T. Seaborg (University of California, Berkeley)

  8. Widely known Element Predicted Predictor • S. G. Thompson, K. Street,Jr., A. Ghiorso and G. T. Seaborg (University of California, Berkeley) Californium 1950 1950 Einsteinium 1952 1952 Fermium 1952 1952 Mendelevium 1955 1955 Nobelium 1958 1958 Lawrencium 1961 1661 • A. Ghiorso et al. (Argonne Laboratory, Los Alamos Laboratory and University of California, Berkeley) A. Ghiorso et al. (Argonne Laboratory, Los Alamos Laboratory and University of California, Berkeley) A. Ghiorso, G. Harvey, R. Choppin, S. G. Thompson and G. T. Seaborg A. Ghiorso, T. Sikkeland, R. Walton and G. T. Seaborg • A. Ghiorso, T. Sikkeland, E. Larsh and M. Latimer

  9. Widely known Element Predicted Predictor A. Ghiorso, M. Nurmia, J. Harris, K. Eskola and P. Eskola Rutherfordium 1968 1968 Dubnium 1970 1970 Seaborgium 1974 1974 Bohrium 1981 1981 Meitnerium 1982 1982 Hassium 1984 1984 A. Ghiorso, M. Nurmia, K. Eskola, J. Harris and P. Eskola A. Ghiorso, J. Nitschke, J. Alonso, C. Alonso, M. Nurmia, G. T. Seaborg, K. Hulet and W. Lougheed G.Münzenberg et al. (GSI in Darmstadt) G. Münzenberg, P. Armbruster et al. (GSI in Darmstadt) G. Münzenberg, P. Armbruster et al. (GSI in Darmstadt)

  10. Widely known Predictor Element Predicted Darmstadtium 1994 1994 S. Hofmann et al. (GSI in Darmstadt) Roentgenium 1994 1994 S. Hofmann et al. (GSI in Darmstadt) Copernicium 1996 1996 Flerovium 1999 1999 Livermorium 2000 2000 S. Hofmann et al. (GSI in Darmstadt) Y.Oganessian et al. (JINR in Dubna) Y.Oganessian et al. (JINR in Dubna)

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