Discovered By: Paul-Emie Lecoq de Boisbaudran
Discovery year: 1879

The following table showing some properties of Samarium(Sm):

Table Example
Atomic number 62
Group n/a
Period 6
Block f
Electrons 62
Protons 62
Neutrons 88
Atomic weight 150.36
Oxidation states +2, +3
Ionic charge Sm^3+, Sm^2+


Table Example
Electrons per shell K2 L8 M18 N24 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^6
Atomic radius 238 pm
Covalent radius 198 pm
Boiling point 1803°C
Melting point 1072°C
Thermal conductivity 13 W.m^-1.K^-1
Phase Solid
Fusion heat 8.6 kJ.mol^-1
Thermal expansion 1.27*10^-5 K^-1


Table Example
Vaporization heat 175 kJ.mol^-1
Color Silver
Bulk modulus 38 GPa
Density 7353 kg.m^-3
Molar volume 2.045*10^-5 m^3.mol^-1
Poisson ratio 0.27
Shear modulus 20 GPa
Electrical conductivity 1.1*10^6 S.m^-1
Vickers hardness 412 Mpa


Table Example
Neel point 106 K
Young's modulus 50 GPa
Electrical type Conductor
Magnetic type Paramagnetic
Liquid density 7160 kg.m^-3
Resistivity 9.4*10^-7 Ohm.m
Mohs hadness 1.4
Valence 3
Sound speed 2130 m.s^-1
Electron affinity 50 kJ.mol^-1
First ionization energy 544.5 kJ.mol^-1
Radioactive No
Electronegativity 1.17
Neutron cross section 5900 barn