65Solid
Tb 158.925 Atomic mass · uLanthanides
Terbium
Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.
Discovery 1843 (Carl Gustaf Mosander)
K2L8M18N27O8P2
Physical properties
Values for the element in its standard state.
- Density
- 8.219g/cm³
- Melting point
- 1,629K
- Boiling point
- 3,503K
- Atomic radius
- Not available
- Bonding type
- Metallic
- Molar heat
- 28.91J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 9 electrons; 6s, 2 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
65 electrons Orbital order preserved from source
- Electronegativity
- 1.2Pauling scale
- First ionization energy
- 566kJ/mol
- Electron affinity
- 50kJ/mol
- Van der Waals radius
- Not available
Tb TerbiumAtomic number 65
566kJ/mol
Atomic numberGaps indicate unavailable data
About terbium
- Appearance
- Silvery white
- Discovery
- 1843 (Carl Gustaf Mosander)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.