Elements.

Discoverer. Year.

Antimony..............

Valentine.............

1450

Bismuth...........

Valentine...............

1450

Zinc.....................

Paracelsus................

1520

Phosphorus.................

Brandt................

1669

Arsenic..............

Schroder...................

1694

Cobalt................

Brandt................

1733

Nickel................

Crondstadt.................

1751

Hydrogen.............

Cavendish...............

1766

Nitrogen.........

Rutherford...........

1772

Manganese............

Gahn.....................

1774

Oxygen..............

Priestley.........

1774

Tungsten............

d'Elihujar...........

1781

Molybdenum.........

Hjelm................

1782

Tellurium.............

Reichenstein...............

1782

Uranium...........

Klaproth.........

1789

Titanium...........

Klaproth............

1795

Chromium...........

Vauquelin...........

1797

Tellurium...........

Klaporth.............

1798

Columbium..........

Hatchett...........

1801

Tantalum............

Hatchett & Ekeburg..

1802

Palladium............

Wollaston...........

1803

Osmium.............

Tennant.........

1803

Cerium. ..Berzelius, Hisinger & Klaproth..

1803

Iridium..........

Tennant...........

1804

Rhodium..........

Wollaston........

1804

Potassium..........

Davy...................

1807

Sodium...........

Davy................

1807

Barium. . .Davy and Berzelius & Pontin.

1808

Strontium.........

Davy..............

1808

Magnesium...........

Davy................

1808

Calcium.. . Davy and Berzelius & Pontin.

1808

Boron. .Davy and Gay -Lussac & Thenard.

1808

Chlorine......

Davy................

1810

Fluorine...........

Ampere........

1810

Iodine.

Courtois..........

1811

Selenium.

Berzelius.........

1817

Cadmium......................Hermann & Stromeyer...........

1817

Lithium

Arfvedson..........

1817

Silicon.

Berzelius.........

1823

Zirconium

Berzelius........

1824

Bromine

Balard...............

1826

Thorium

Berzelius..........

1828

Yttrium

Wohler........

1828

Glucinum

Wohler..........

1828

Aluminum

Wohler...............

1828

Vanadium

Sefstroem............

1830

Elements.

Discoverer. Year.

Lanthanum..........

Mosander.............

1841

Didymium........

Mosander.........

1841

Erbium..............

Mosander...........

1843

Terbium.............

Mosander...........

1843

Niobium. . (same as Columbium, q. v.). .

1844

Ruthenium............

Claus............

1844

Rubidium..........

Bunsen........

1860

Caesium.............

Bunsen & Kirchhoff.

1860

Thallium..............

Crookes and Lamy .

1862

Indium...............

Reich & Richter.

1863

Gallium..........

Boisbaudran.......

1875

Ytterbium.........

Marignac.....

1878

Samarium.........

Boisbaudran.......

1879

Scandium..........

Nilson........

1879

Thulium..........

Cleve.........

1879

Neodymium..........

Welsbach...........

1885

Praseodymium.....

Welsbach.........

1885

Gadolinium......

Marignac.......

1886

Germanium.....

Winkler...........

1886

Argon.............

Rayleigh & Ramsay...

1894

Krypton.......

Ramsay & Travers. ...

1897

Neon...........

Ramsay & Travers. ...

1898

Coronium...........

Nasini......

1898

Xenon.........

Ramsay........

1898

Victorium.........

Crookes..........

1898

Etherion (?).........

Brush........

1898

Polonium........

Curie(Mrs.)........

1898

Radium. Curies (Mrs. & Mr.) and Bemont.

1898

Actinium.........

Debierne.......

1899

(Must not be confounded with Phipson's actinium.)

Asterium hydrogen.

Lockyer...........

1899

(New) unknown.

Thorium α...........

Brauner..........

1900

Thorium β..........

Brauner..........

1900

Krypton II...........

Ladenberg & Krugel.

1900

Austrium II.(?).......

Pribram.........

1900

Carolinium..........

Baskerville........

1900

Radio-active lead (?)Hoffmann & Strauss.

1900

"Σ" Europium.......

Demarcay......

1901

Euxenium earth (?)...

Hoffmann & Prandtl

1901

I. & II.

Amarillium (?)......

Courtis..........

1902

Tellurium X.....

Pellini...........

1903

Berzelium....

Baskerville.............

1903

Revised by Professor Charles Baskerville, Ph.D., of the University of North Carolina.

* Gold, silver, tin, copper, iron, lead, mercury, and carbon have been known from the earliest times.