Here's a helpful table chronicling the discovery of the elements. The date is listed for when the element was first isolated. In many cases, the presence of a new element was suspected years or even thousands of years before it could be purified. Click on an element's name to see its entry in the Periodic Table and get facts for the element.

Ancient Times - Prior to 1 A.D.

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

1745 to 1755

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

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

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

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

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

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

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

1995 to 2005

Nihonium - Nh - Atomic Number 113 (Hofmann, Ninov et al. GSI-Germany 1996)

Flerovium - Fl - Atomic Number 114 (Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory 1999)

Livermorium - Lv - Atomic Number 116 (Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory 2000)

Oganesson - Og - Atomic Number 118 (Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory 2002)

Moscovium - Mc - Atomic Number 115 (Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory 2003)

2005 to Present

Tennessine - Ts - Atomic Number 117 (Joint Institute for Nuclear Research, Lawrence Livermore National Laboratory, Vanderbilt University and Oak Ridge National Laboratory 2009)

Will There Be More?

While the discovery of 118 elements "completes" the periodic table, scientists are working to synthesize new, superheavy nuclei. When one of these elements is verified, another row will be added to the periodic table.