Thulium (Tm)
Thulium is the rarest naturally occurring lanthanide and is used in portable X-ray devices.
Properties of Thulium
- Atomic number
- 69
- Category
- Lanthanide
- Atomic mass
- 168.93 u
- Electron configuration
- [Xe] 4f¹³ 6s²
- Melting point
- 1818 K (1544.85 °C)
- Boiling point
- 2223 K (1949.85 °C)
- Density
- 9.321 g/cm³
- Electronegativity (Pauling)
- 1.25
- Appearance
- Silvery-gray metal
- Discovered by
- Per Teodor Cleve (1879)
Facts about Thulium
- Thulium is named after Thule, an ancient name for Scandinavia!
- Thulium is the rarest of all the naturally occurring lanthanides!
- Thulium is used in portable X-ray machines for doctors in the field!
- Thulium lasers are used in surgery because they are very precise!