Chemical Element: thulium
(Modern Latin: from Greek, Thule, the Greek name for land north of Britain or for Scandinavia; rare earth)
Chemical-Element InformationSymbol: Tm
Atomic number: 69
Year discovered: 1879
Discovered by: Per Teodor Cleve (1840-1905), a Swedish chemist.
- Per Teodor Cleve of Sweden discovered holmium, in 1879, while working on erbia earth (erbium oxide).
- Thulium oxide (holmia) was present as an impurity in erbia.
- The element is named after Thule, the ancient name for Scandinavia.
- Greek geographers thought Thule was the most northerly region of the habitable world.
- The metal is readily oxidized by air or by water.
Name in other languages:
Information about other elements may be seen at this Chemical Elements List.
A special unit about words that include chemo-, chem- may be seen here.