Timeline of chemical element discoveries Modern discoveries Modern discoveries

| Z | Element_ | Observed_or_predicted | Isolated_widely_known | Observer | First_isolator | Notes_ |
|---|---|---|---|---|---|---|
| 102 | Nobelium | 1958 |  | A. Ghiorso, T. Sikkeland, R. Walton and G. T. Seaborg |  | First prepared by bombardment of curium with carbon atoms. |
| 103 | Lawrencium | 1961 |  | A. Ghiorso, T. Sikkeland, E. Larsh and M. Latimer |  | First prepared by bombardment of californium with boron atoms. |
| 104 | Rutherfordium | 1968 |  | A. Ghiorso, M. Nurmia, J. Harris, K. Eskola and P. Eskola |  | Prepared by bombardment of californium with carbon atoms. |
| 105 | Dubnium | 1970 |  | A. Ghiorso, M. Nurmia, K. Eskola, J. Harris and P. Eskola |  | Prepared by bombardment of californium with nitrogen atoms. |
| 106 | Seaborgium | 1974 |  | A. Ghiorso, J. Nitschke, J. Alonso, C. Alonso, M. Nurmia, G. T. Seaborg, K. Hulet and W. Lougheed |  | Prepared by collisions of californium-249 with oxygen atoms. |