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.
Experiment with the elements
Terbium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.