Discovered By: Carl Gustaf Mosander
Discovery year: 1843

The following table showing some properties of Terbium(Tb):

Table Example
Atomic number 65
Group n/a
Period 6
Block f
Electrons 65
Protons 65
Neutrons 94
Atomic weight 158.92535
Oxidation states +3, +4
Ionic charge Tb^3+


Table Example
Electrons per shell K2 L8 M18 N27 O8 P2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^9
Atomic radius 225 pm
Covalent radius 194 pm
Boiling point 3230°C
Melting point 1356°C
Neel point 230 K
Phase Solid
Fusion heat 10.8 kJ.mol^-1
Specific heat 182 J.kg^-1.K^-1


Table Example
Thermal expansion 1.03*10^-5 K^-1
Vaporization heat 295 kJ.mol^-1
Color Silver
Brinell hardness 677 MPa
Bulk modulus 38.7 GPa
Density 8219 kg.m^-3
Liquid density 7650 kg.m^-3
Mohs hardness 2.3
Poisson ratio 0.26
Shear modulus 22 GPa


Table Example
Sound speed 2620 m.s^-1
Thermal conductivity 11 W.m^-1.K^-1
Vickers hardness 863 MPa
Young's modulus 56 GPa
Electrical conductivity 8.3*10^5 S.m^-1
Electric type Conductor
Magnetic type Paramagnetic
Resistivity 1.2*10^-6 Ohm.m
Curie point 222 K
Valence 3
Electron affinity 50 kJ.mol^-1
First ionization energy 565.8 kJ.mol^-1
Radioactive No
Neutron cross section 23 barn