Stable isotope Samarium (Sm)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Sm-144 62 82 143.911996 3.10% 88.00-93.00% Oxide
Sm-147 62 85 146.914894 15.0% 94.00-96.50% Oxide
Sm-148 62 86 147.914818 11.30% 91.00-96.50% Oxide
Sm-149 62 87 148.917180 13.80% >94.00% Oxide
Sm-150 62 88 149.917272 7.40% >94.00% Oxide
Sm-152 62 90 151.919729 26.70% ≥98.40% Oxide
Sm-154 62 92 153.922206 22.70% >98.50% Oxide

Properties of Samarium

Name Samarium
Symbol Sm
Atomic number 62
Atomic weight 150.36
Standard state Solid at 298 °K
CAS Registry ID 7440-19-9
Group in periodic table N/A
Group name Lanthanoid
Period in periodic table 6 (Lanthanoid)
Block in periodic table f-block
Color Silvery white
Classification Metallic
Melting point 1074 °C
Boiling point 1791 °C
Vaporization point 1791 °C
Thermal conductivity 13.3 W/(m·K) at 298.2 °K
Electrical resistivity 94.0 µΩ·cm at 25 °C
Electronegativity 1.2
Specific heat 0.180 J/g mol at 20 °C
Heat of vaporization 175 kJ·mol-1 at 1791 °C
Heat of fusion 8.9 kJ·mol-1
Density of liquid 7.16 g/cm3 at 1074 °C
Density of solid 7.52 g/cm3
Electron configuration [Xe]4f66s2
Atomic radius 1.804 Å
Ionic radius Sm3+: 1.08 Å (coordination number 8)
Oxidation states +2, +3