Penemuan unsur kimia
Abad ke-19

| Nama | Tanggal | Penemu | Catatan |
| --- | --- | --- | --- |
| Vanadium | 1801 | Andrés Manuel del Río |  |
| Niobium | 1801 | Charles Hatchett | Named columbium by discoverer. |
| Tantalum | 1802 | Anders Gustaf Ekeberg |  |
| Serium | 1803 | Martin Heinrich Klaproth, Jöns Jakob Berzelius dan Hisinger | Dinamakan setelah baru ditemukan [asteroid []],  Ceres. Ditemukan hampir bersamaan di dua laboratorium, meskipun kemudian menunjukkan bahwa cerium Berzelius dan Hisinger itu sebenarnya merupakan campuran dari cerium, lantanum dan disebut didymium. |
| Rhodium | 1803 | William Hyde Wollaston |  |
| Palladium | 1803 | Ryan Lumadue | Dinamai setelah ditemukan asteroid terbaru, Pallas. |
| Osmium | 1803 | Smithson Tennant |  |
| Iridium | 1803 | Smithson Tennant |  |
| Potassium | 1807 | Humphry Davy | Discovered using electricity from the Voltaic pile to decompose the salts of alkali metals. |
| Sodium | 1807 | Humphry Davy | Discovered using electricity from the Voltaic pile to decompose the salts of alkali metals; discovered a few days after potassium, using the same method. |
| Calcium | 1808 | Humphry Davy | Discovered using electricity from the Voltaic pile to decompose the salts of alkali metals. |
| Barium | 1808 | Humphry Davy | Discovered using electricity from the Voltaic pile to decompose the salts of alkali metals. |
| Boron | 1808 | Joseph Louis Gay-Lussac & Louis-Jacques Thenard |  |
| Yodium | 1811 | Bernard Courtois |  |
| Lithium | 1817 | Johan August Arfwedson |  |
| Cadmium | 1817 | Friedrich Strohmeyer Independently discovered by K.S.L Hermann |  |
| Selenium | 1817 | Jöns Jakob Berzelius |  |
| Silicon | 1823 | Jöns Jakob Berzelius |  |
| Aluminium | 1825 | Hans Christian Ørsted | May have been isolated in Roman times, see History of Aluminium. |
| Brom | 1826 | Antoine Jérôme Balard |  |
| Thorium | 1828 | Jöns Jakob Berzelius |  |
| Beryllium | 1828 | Friedrich Wöhler. Independently discovered by A.A.B. Bussy |  |
| Lantanum | 1839-41 | Carl Gustaf Mosander | Discovered when Mosander showed that the cerium isolated in 1803 by Berzelius was actually a mixture of cerium, lanthanum and so-called didymium. |
| Terbium | 1843 | Carl Gustaf Mosander |  |
| Erbium | 1843 | Carl Gustaf Mosander |  |
| Rutenium | 1844 | Karl Klaus |  |
| Caesium | 1860 | Robert Bunsen and Gustav Kirchoff | First identified by its blue spectroscopic emission line. |
| Rubidium | 1860 | Robert Bunsen and Gustav Kirchoff | First identified by its red spectroscopic emission line. |
| Talium | 1861 | Sir William Crookes | First identified by its bright green spectroscopic emission line. |
| Indium | 1863 | Ferdinand Reich and Theodor Richter | First identified by its indigo-blue spectroscopic emission line. |
| Helium | 1868 | Independently by Pierre Jansen and Norman Lockyer | First identified by astronomers as an emission line in the spectrum of the sun. |
| Galium | 1875 | Paul Emile Lecoq de Boisbaudran | Predicted by Mendeleev in 1871 as ekaaluminium. |
| Ytterbium | 1878 | Jean Charles Galissard de Marignac |  |
| Thulium | 1879 | Per Teodor Cleve |  |
| Skandium | 1879 | Lars Fredrik Nilson | Predicted by Mendeleev in 1871 as ekaboron. |
| Holmium | 1879 | Marc Delafontaine, Jacques-Louis Soret and Per Teodor Cleve |  |
| Samarium | 1879 | Paul Emile Lecoq de Boisbaudran |  |
| Gadolinium | 1880 | Jean Charles Galissard de Marignac |  |
| Praseodymium | 1885 | Carl Auer von Welsbach | The didymium isolated by Mosander in 1839 was shown to be two separate elements; praseodymium and neodymium. |
| Neodimium | 1885 | Carl Auer von Welsbach | The didymium isolated by Mosander in 1839 was shown to be two separate elements, praseodymium and neodymium. |
| Dysprosium | 1886 | Paul Emile Lecoq de Boisbaudran |  |
| Germanium | 1886 | Clemens Winkler | Predicted by Mendeleev in 1871 as ekasilicon. |
| Fluor | 1886 | Joseph Henri Moissan |  |
| Argon | 1894 | Lord Rayleigh & Sir William Ramsay | Discovered by comparing the molecular weights of nitrogen prepared by liquefaction from air and nitrogen prepared by chemical means. |
| Neon | 1898 | Sir William Ramsay | Separated from liquid argon by difference in boiling point. |
| Kripton | 1898 | Sir William Ramsay | Separated from liquid argon by difference in boiling point. |
| Xenon | 1898 | Sir William Ramsay | Separated from liquid argon by difference in boiling point. |
| Radium | 1898 | Pierre Curie and Marie Curie |  |
| Polonium | 1898 | Pierre Curie and Marie Curie |  |
| Radon | 1898 | Friedrich Ernst Dorn, who called it nitron | Discovered as a product of the radioactive decay of radium. |
| Actinium | 1899 | Ryan Lumadue |  |