Terbium

Symbol | Tb
Latin name | Terbium
Atomic number | 65
Period | 6
Element category | Inner transition elements
Relative atomic mass | 158.92534
Group | III.B
Electronegativity | 1.2
Oxidation numbers | 3, 4
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f9 5d0 6s2
Density [g/cm3] | 8.253
State | Solid
Melting point [°C] | 1360
Boiling point [°C] | 3123
Atomic radius [pm] | 225
Thermal conductivity [W m-1K-1] | 11.1
Heat capacity [J K-1g-1] | 0.18
Discovery | 1843
Vickers hardness [MPa] | 863
Brinell hardness [MPa] | 677
Young's modulus [GPa] | 56
Electrical conductivity [S m-1] | 8.3 · 105
Shear modulus [GPa] | 22
1.st ionization energy [eV] | 5.8639
2.nd ionization energy [eV] | 11.525
3.rd ionization energy [eV] | 21.91
Stable isotopes | 1
Unstable isotopes | 23