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Time Line of Elements Discovery

Dates

Elements

Ancient Times
Prior to 1 A.D. 

Gold
Silver
Copper
Iron
Lead
Tin
Mercury
Sulfur
Carbon

Time of the Alchemists
1 A.D. to 1735 

Arsenic (Magnus ~1250)
Antimony (17th century or earlier)
Phosphorus (Brand 1669)
Zinc (13th Century India)

1735 to 1745 

Cobalt (Brandt ~1735)
Platinum (Ulloa 1735)

1745 to 1755 

Nickel (Cronstedt 1751)
Bismuth (Geoffroy 1753)

1755 to 1765 

--

1765 to 1775 

Hydrogen (Cavendish 1766)
Nitrogen (
Rutherford 1772)
Oxygen (Priestley; Scheele 1774)
Chlorine (Scheele 1774)
Manganese (Gahn, Scheele, & Bergman 1774)

1775 to 1785 

Molybdenum (Scheele 1778)
Tungsten (J. and F. d'Elhuyar 1783)
Tellurium (von Reichenstein 1782)

1785 to 1795 

Uranium (Peligot 1841)
Strontium (Davey 1808)
Titanium (Gregor 1791)
Yttrium (Gadolin 1794)

1795 to 1805 

Vanadium (del Rio 1801)
Chromium (Vauquelin 1797)
Beryllium (Vauquelin 1798)
Niobium (Hatchett 1801)
Tantalum (Ekeberg 1802)
Cerium (Berzelius & Hisinger; Klaproth 1803)
Palladium (Wollaston 1803)
Rhodium (Wollaston 1803-1804)
Osmium (Tennant 1803)
Iridium (Tennant 1803)

1805 to 1815 

Sodium (Davy 1807)
Potassium (Davy 1807)
Barium (Davy 1808)
Calcium (Davy 1808)
Magnesium (Black 1775; Davy 1808)
Boron (Davy; Gay-Lussac & Thenard 1808)
Iodine (Courtois 1811)

1815 to 1825 

Lithium (Arfvedson 1817)
Cadmium (Stromeyer 1817)
Selenium (Berzelius 1817)
Silicon (Berzelius 1824)
Zirconium (Klaproth 1789; Berzelius 1824)

1825 to 1835 

Aluminum (Wohler 1827)
Bromine (Balard 1826)
Thorium (Berzelius 1828)

1835 to 1845 

Lanthanum (Mosander 1839)
Terbium (Mosander 1843)
Erbium (Mosander 1842 or 1843)
Ruthenium (Klaus 1844)

1845 to 1855 

--

1855 to 1865 

Cesium (Bunsen & Kirchoff 1860)
Rubidium (Bunsen & Kirchoff 1861)
Thallium (Crookes 1861)
Indium (Riech & Richter 1863)

1865 to 1875 

Fluorine (Moissan 1866)

1875 to 1885 

Gallium (Boisbaudran 1875)
Ytterbium (Marignac 1878)
Samarium (Boisbaudran 1879)
Scandium (Nilson 1878)
Holmium (Delafontaine 1878)
Thulium (Cleve 1879)

1885 to 1895 

Praseodymium (von Weisbach 1885)
Neodymium (von Weisbach 1885)
Gadolinium (Marignac 1880)
Dysprosium (Boisbaudran 1886)
Germanium (Winkler 1886)
Argon (Rayleigh & Ramsay 1894)

1895 to 1905 

Helium (Janssen 1868; Ramsay 1895)
Europium (Boisbaudran 1890; Demarcay 1901)
Krypton (Ramsay & Travers 1898)
Neon (Ramsay & Travers 1898)
Xenon (Ramsay & Travers 1898)
Polonium (Curie 1898)
Radium (P. & M. Curie 1898)
Actinium (Debierne 1899)
Radon (Dorn 1900)

1905 to 1915 

Lutetium (Urbain 1907)

1915 to 1925 

Hafnium (Coster & von Hevesy 1923)
Protactinium (Fajans & Gohring 1913; Hahn & Meitner 1917)

1925 to 1935 

Rhenium (Noddack, Berg, & Tacke 1925)

1935 to 1945 

Technetium (Perrier & Segre 1937 )
Francium (Perey 1939)
Astatine (Corson et al 1940)
Neptunium (McMillan & Abelson 1940)
Plutonium (Seaborg et al. 1940)
Curium (Seaborg et al. 1944)

1945 to 1955 

Mendelevium (Ghiorso, Harvey, Choppin, Thompson, and Seaborg 1955)
Fermium (Ghiorso et al. 1952)
Einsteinium (Ghiorso et al. 1952)
Americium (Seaborg et al. 1944)
Promethium (Marinsky et al. 1945)
Berkelium (Seaborg et al. 1949)
Californium (Thompson, Street, Ghioirso, and Seaborg: 1950)

1955 to 1965 

Nobelium (Ghiorso, Sikkeland, Walton, and Seaborg 1958)
Lawrencium (Ghiorso et al. 1961)
Rutherfordium (L Berkeley Lab, USA - Dubna Lab, Russia 1964)

1965 to 1975 

Dubnium (L Berkeley Lab, USA - Dubna Lab, Russia 1967)
Seaborgium (L Berkeley Lab, USA - Dubna Lab, Russia 1974)

1975 to 1985 

Bohrium (Dubna Russia 1975)
Meitnerium (Armbruster, Munzenber et al. 1982)
Hassium (Armbruster, Munzenber et al. 1984)

1985 to 1995 

Ununnilium (Hofmann, Ninov, et al. GSI-Germany 1994)
Ununumium (Hofmann, Ninov et al. GSI-Germany 1994)

1995 to 2005 

Ununbium (Hofmann, Ninov et al. GSI-Germany 1996)