Timeline of chemical element discoveries Modern discoveries Modern discoveries

| Z | Element_ | Observed_or_predicted | Isolated_widely_known | Observer | First_isolator | Notes_ |
|---|---|---|---|---|---|---|
| 13 | Aluminium | 1825 | 1825 | H.C.Ørsted | H.C.Ørsted | Antoine Lavoisier predicted in 1787 that alumine is the oxide of an undiscovered element, and in 1808 Humphry Davy tried to decompose it. Although he failed, he suggested the present name. Hans Christian Ørsted was the first to isolate metallic aluminium in 1825. |
| 35 | Bromine | 1825 | 1825 | J. Balard and L. Gmelin | J. Balard and L. Gmelin | They both discovered the element in the autumn of 1825 and published the results the next year. |
| 90 | Thorium | 1829 |  | J. Berzelius |  | Berzelius obtained the oxide of a new earth in thorite. |
| 57 | Lanthanum | 1838 |  | G. Mosander |  | Mosander found a new element in samples of ceria and published his results in 1842, but later he showed that this lanthana contained four more elements. |
| 68 | Erbium | 1842 |  | G. Mosander |  | Mosander managed to split the old yttria into yttria proper and erbia, and later terbia too. |