Entity: THULIUM
Thulium is a soft silvery metallic element of the rare-earth group, with symbol Tm and atomic number 69. It is the thirteenth element in the lanthanide series of metals and is the second-least abundant lanthanide in the Earth's crust.
THULIUM
Etymology
The name 'thulium' is derived from Thule, the ancient name for Scandinavia.
Definition
Thulium is a soft silvery metallic element of the rare-earth group, with symbol Tm and atomic number 69. It is the thirteenth element in the lanthanide series of metals and is the second-least abundant lanthanide in the Earth's crust.
Historical Context
Thulium was discovered in 1879 by Per Teodor Cleve in Sweden. It has since found applications in portable X-ray machines due to its ability to emit X-rays.
Cultural Significance
Thulium does not have significant cultural significance beyond its scientific and industrial uses.
Related Concepts
Thulium is related to other rare-earth elements like promethium and gadolinium.
See Also
- Lanthanides
- Rare-earth elements
A rare-earth metallic element found in minerals like euxenite, gadolinite, etc, with symbol Tm and atomic number 69.