Timeline of chemical element discoveries Modern discoveries Modern discoveries

| Z | Element_ | Observed_or_predicted | Isolated_widely_known | Observer | First_isolator | Notes_ |
|---|---|---|---|---|---|---|
| 9 | Fluorine | 1810 | 1886 | A.-M. Ampère | H. Moissan | André-Marie Ampère predicted an element analogous to chlorine obtainable from hydrofluoric acid, and between 1812 and 1886 many researchers tried to obtain this element. It was eventually isolated by Moissan. |
| 53 | Iodine | 1811 | 1811 | B. Courtois | B. Courtois | Courtois discovered it in the ashes of seaweed. |
| 3 | Lithium | 1817 | 1821 | A. Arfwedson | W. T. Brande | Arfwedson discovered the alkali in petalite. |
| 48 | Cadmium | 1817 | 1817 | S. L Hermann, F. Stromeyer, and J.C.H. Roloff | S. L Hermann, F. Stromeyer, and J.C.H. Roloff | All three found an unknown metal in a sample of zinc oxide from Silesia, but the name that Stromeyer gave became the accepted one. |