| Invention or discovery | Date | Inventor or discoverer |
|---|---|---|
| Molybdenum | 1778 | Carl Wilhelm Scheele |
| Tellurium | 1783 | Franz-Joseph Müller von Reichenstein |
| Palladium | 1803 | William Hyde Wollaston |
| Rhodium | 1803 | William Hyde Wollaston |
| Cadmium | 1817 | Karl Samuel Leberecht Hermann |
| Ruthenium | 1844 | Karl Ernst Claus |
| Indium | 1863 | Ferdinand Reich |
| Xenon | July 12, 1898 | Morris Travers |
| Protactinium | 1917 | Kazimierz Fajans |
| Technetium | 1937 | Emilio G. Segrè |
| Neptunium | 1940 | Edwin McMillan |
| Plutonium | 1941 | Joseph W. Kennedy |