65 Tb 158.93
Terbium
Lanthanide
Terbium (Tb) is a chemical element with atomic number 65, classified as a lanthanide. At room temperature it is a solid. It was discovered in 1843 by Carl Gustaf Mosander.
Properties
- Atomic number
- 65
- Atomic mass
- 158.93 u
- Category
- Lanthanide
- Group
- 0
- Period
- 6
- Block
- f-block
- Electron configuration
- [Xe] 4f⁹ 6s²
- Phase at STP
- Solid
- Density
- 8.229 g/cm³
- Melting point
- 1629 K (1355.8 °C)
- Boiling point
- 3503 K (3229.8 °C)
- Electronegativity
- 1.2
- Atomic radius
- 225 pm
- Ionization energy
- 5.864 eV
- Discovery
- 1843 · Carl Gustaf Mosander
Common uses
Phosphors, lasers, fuel cells, magnets
Did you know?
Creates green color in fluorescent lights and named after Ytterby, Sweden.