Thulium (Tm)
A fascinating lanthanide element.
Thulium is element 69 on the periodic table.
Element properties
- Atomic number
- 69
- Symbol
- Tm
- Atomic mass
- 168.93 u
- Category
- Lanthanide
- Period
- 6
- Group
- Not assigned
- Block
- f
- State
- Solid
- Electron configuration
- [Xe] 4f13 6s2
- Electronegativity (Pauling)
- 1.25
- Density
- 9.32 g/cm³
- Melting point
- 1545 °C
- Boiling point
- 1950 °C