Technical data for Samarium

Overview Name Samarium Symbol Sm Atomic Number 62 Atomic Weight 150.36 Density 7.353 g/cm3 Melting Point 1072 °C Boiling Point 1803 °C Thermal properties Phase Solid Melting Point 1072 °C Boiling Point 1803 °C Absolute Melting Point 1345 K Absolute Boiling Point 2076 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 8.5 kJ/mol Heat of Vaporization 175 kJ/mol Specific Heat 196 J/(kg K)[note] Adiabatic Index N/A Neel Point 106 K Thermal Conductivity 13 W/(m K) Thermal Expansion 0.0000127 K-1 Bulk physical properties Density 7.353 g/cm3 Density (Liquid) 7.16 g/cm3 Molar Volume 0.000020449 Brinell Hardness 441 MPa Mohs Hardness 1.44[note] Vickers Hardness 412 MPa Bulk Modulus 38 GPa Shear Modulus 20 GPa Young Modulus 50 GPa Poisson Ratio 0.27 Refractive Index N/A Speed of Sound 2130 m/s Thermal Conductivity 13 W/(m K) Thermal Expansion 0.0000127 K-1 Reactivity Valence 3 Electronegativity 1.17 ElectronAffinity 50 kJ/mol Ionization Energies 544.5, 1070, 2260, 3990 kJ/mol Health and Safety DOT Hazard Class 4.1 DOT Numbers 1325 RTECS Number N/A NFPA Label

Classifications Alternate Names None Names of Allotropes None Block f Group N/A Period 6 Series Lanthanide Electron Configuration [Xe]6s24f6 Color Silver Discovery 1879 in France Gas phase N/A CAS Number CAS7440-19-9 CID Number CID23951 RTECS Number N/A Electrical properties Electrical Type Conductor Electrical Conductivity 1.1×106 S/m Resistivity 9.4×10-7 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 1.11×10-7 m3/Kg Molar Magnetic Susceptibility 1.669×10-8 m3/mol Volume Magnetic Susceptibility 0.00081618 Abundances % in Universe 5×10-7% % in Sun 1×10-7% % in Meteorites 0.000017% % in Earth's Crust 0.0006% % in Oceans 4.5×10-11% % in Humans N/A Atomic dimensions and structure Atomic Radius 238 pm Covalent Radius 198 pm Van der Waals Radius N/A Crystal Structure Simple Trigonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 362.1, 362.1, 2625 pm Space Group Name R_ 3m Space Group Number 166 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 7F0 Neutron Cross Section 5.9×103 Neutron Mass Absorption 4.7 Known Isotopes 128Sm, 129Sm, 130Sm, 131Sm, 132Sm, 133Sm, 134Sm, 135Sm, 136Sm, 137Sm, 138Sm, 139Sm, 140Sm, 141Sm, 142Sm, 143Sm, 144Sm, 145Sm, 146Sm, 147Sm, 148Sm, 149Sm, 150Sm, 151Sm, 152Sm, 153Sm, 154Sm, 155Sm, 156Sm, 157Sm, 158Sm, 159Sm, 160Sm, 161Sm, 162Sm, 163Sm, 164Sm, 165Sm Stable Isotopes 144Sm, 149Sm, 150Sm, 152Sm, 154Sm Isotopic Abundances 144Sm 3.07% 147Sm 14.99% 148Sm 11.24% 149Sm 13.82% 150Sm 7.38% 152Sm 26.75% 154Sm 22.75%