Columbium Hatchett 1801 Tantalum Ekeberg 1802 Iridium Tenant 1803 Osmium Tenant 1803 Cerium Berzelius 1803 Palladium Wollaston 1804 Rhodium Wollaston 1804 Potassium Davy 1807 Sodium Davy 1807 Barium Davy 1808 Strontium Davy 1808 Calcium Davy 1808 Boron Davy 1808 Iodine Courtois 1811 Cyanogen Gay Lussac 1814 (Comp. rad.) Selenium Berzelius 1817 Cadmium 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 Magnesium Bussey 1829 Vanadium Sefstroem 1830 Lanthanum Mosander 1839 Didymium Mosander 1839 Erbium Mosander 1843 Terbium Mosander 1843 Ruthenium Claus 1845 Rubidium Bunsen 1860 Caesium Bunsen 1860 Thallium Crookes 1862 Indium {Reich } 1863 {Richter} 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 {Raleigh} 1894 {Ramsey } Krypton { Ramsey } 1897 { Travers } Neon {Ramsey } 1898 {Travers} Metargon { Ramsey } 1898 { Travers } Coronium Nasini 1898 Xenon Ramsey 1898 Monium Crookes 1898 Etherion (?) Brush 1898