Timeline of chemical element discoveries Modern discoveries Modern discoveries

| Z | Element_ | Observed_or_predicted | Isolated_widely_known | Observer | First_isolator | Notes_ |
|---|---|---|---|---|---|---|
| 71 | Lutetium | 1906 | 1906 | G. Urbain and C.A. von Welsbach | G. Urbain and C.A. von Welsbach | Urbain and von Welsbach proved independently that the old ytterbium also contained a new element. |
| 75 | Rhenium | 1908[contradiction] | 1908 | M. Ogawa | M. Ogawa | Ogawa found it in thorianite but assigned it as element 43 instead of 75 and named it nipponium. In 1922 Walter Noddack, Ida Eva Tacke and Otto Berg announced its separation from gadolinite and gave it the present name. |