Timeline of chemical element discoveries Modern discoveries Modern discoveries

| Z | Element_ | Observed_or_predicted | Isolated_widely_known | Observer | First_isolator | Notes_ |
|---|---|---|---|---|---|---|
| 66 | Dysprosium | 1886 |  | P.E.L. de Boisbaudran |  | De Boisbaudran found a new earth in erbia. |
| 32 | Germanium | 1886 |  | A. Winkler |  | In February 1886 Winkler found in argyrodite the eka-silicon that Mendeleev had predicted in 1871. |
| 18 | Argon | 1894 | 1894 | Lord Rayleigh and W. Ramsay | Lord Rayleigh and W. Ramsay | They discovered the gas by comparing the molecular weights of nitrogen prepared by liquefaction from air and nitrogen prepared by chemical means. It is the first noble gas to be isolated. |
| 36 | Krypton | 1898 | 1898 | W. Ramsay and W. Travers | W. Ramsay and W. Travers | On May 30, 1898, Ramsay separated a third noble gas from liquid argon by difference in boiling point. |