Timeline of chemical element discoveries Modern discoveries Modern discoveries

| Z | Element_ | Observed_or_predicted | Isolated_widely_known | Observer | First_isolator | Notes_ |
|---|---|---|---|---|---|---|
| 39 | Yttrium | 1794 | 1840 | J. Gadolin | G. Mosander | Discovered in gadolinite, but Mosander showed later that its ore, yttria, contained more elements. |
| 4 | Beryllium | 1798 | 1828 | N. Vauquelin | F. Wöhler and A. Bussy | Vauquelin discovered the oxide in beryl and emerald, and Klaproth suggested the present name around 1808. |
| 23 | Vanadium | 1801 | 1830 | M. del Río | N.G.Sefström | Río found the metal in vanadinite but retracted the claim after Hippolyte Victor Collet-Descotils disputed it. Sefström isolated and named it, and later it was shown that Río had been right in the first place. |