Terbium (Tb)
Terbium (Tb) is element 65 of the periodic table, a lanthanide in period 6, in the f-block. Its standard atomic weight is 158.925354, so one mole of terbium atoms has a mass of 158.925354 g. At room temperature it is a solid; it melts at 1355.85 °C and boils at 3229.85 °C.
| Atomic number | 65 |
|---|---|
| Symbol | Tb |
| Standard atomic weight | 158.925354 |
| Molar mass | 158.925354 g/mol |
| Category | Lanthanide |
| Group | f-block (lanthanide series) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 6s2 4f9 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | — |
| Atomic radius (van der Waals) | 221 pm |
| First ionisation energy | 5.864 eV (565.8 kJ/mol) |
| Electron affinity | — |
| State at room temperature | Solid |
| Melting point | 1629 K (1355.85 °C) |
| Boiling point | 3503 K (3229.85 °C) |
| Density | 8.23 g/cm³ |
| Discovered | 1843 |
Lanthanides
La · LanthanumCe · CeriumPr · PraseodymiumNd · NeodymiumPm · PromethiumSm · SamariumEu · EuropiumGd · GadoliniumDy · DysprosiumHo · HolmiumEr · ErbiumTm · ThuliumYb · Ytterbium
Calculate with Terbium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.