Terbium was discovered in 1843 by the Swedish chemist Carl Gustaf Mosander.
Name: Terbium
Symbol: Tb
Atomic number: 65
Atomic weight: 158.93
State: solid
Group, period, block: n/a, 6, f
Color: silvery white
Classification: lanthanide
Electron configuration: 4f9 6s2
2,8,18,27,8,2
Physical properties
Density: 8.23 g/cm-3
Melting point: 1629 K,1356 °C,2473 °F
Boiling point: 3503 K,3230 °C,5846 °F
Atomic properties
Oxidation states: 4, 3, 2, 1
Electronegativity: 1.2 (Pauling scale)
Ionization energies: 1st: 565.8 kJ·mol-1
Covalent radius: 194±5 pm
Van der Waals radius: no data
- Tb
Electron Configuration
Isotopes
There is one naturally occurring isotope of terbium exists, 159Tb.