Samarium, 62 General properties Pronunciation Template:Infobox element/pronunciation Appearance silvery white Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Samarium in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 62 Group Template:Infobox element/group Period period 6 Block f-block Element category Template:Infobox element/category format Electron configuration [Xe ] 4f6 6s2 Electrons per shell
2, 8, 18, 24, 8, 2 Physical properties Phase at STP solid Melting point 1345 K (1072 °C, 1962 °F) Boiling point 2173 K (1900 °C, 3452 °F) Density (near r.t. ) 7.52 g/cm3 when liquid (at m.p. ) 7.16 g/cm3 Heat of fusion 8.62 kJ/mol [[Enthalpy of vaporization|Heat of Template:Engvar ]] 192 kJ/mol Molar heat capacity 29.54 J/(mol·K) [[Vapor pressure|Template:Engvar pressure Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state Electronegativity Pauling scale: 1.17 [[Ionization energy|Template:Engvar energies]] 1st: 544.5 kJ/mol 2nd: 1070 kJ/mol 3rd: 2260 kJ/mol Atomic radius empirical: 180 pm Covalent radius 198±8 pm Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure Speed of sound thin rod 2130 m/s (at 20 °C) Thermal expansion (r.t. ) (α, poly) 12.7 µm/(m·K) Thermal conductivity 13.3 W/(m·K) Electrical resistivity (r.t. ) (α, poly) 0.940 µΩ·m Magnetic ordering paramagnetic [1] Magnetic susceptibility +1860.0·10−6 cm3 /mol (291 K)[2] Young's modulus α form: 49.7 GPa Shear modulus α form: 19.5 GPa Bulk modulus α form: 37.8 GPa Poisson ratio α form: 0.274 Vickers hardness 410–440 MPa Brinell hardness 440–600 MPa CAS Number 7440-19-9 History Naming after the mineral samarskite (itself named after Vassili Samarsky-Bykhovets ) Discovery and first isolationLecoq de Boisbaudran (1879)Main isotopes of samarium Template:Infobox element/isotopes table | references
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