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Samarium,62 👁 Image Samarium Pronunciation /s ə ˈ m ɛər i ə m (sə-MAIR -ee-əm Appearance sillery white Standard atomic weight A r,std (Sm)7002150360000000000♠ 150.36(2)[ 1] Samarium in the periodic cairt
Atomic nummer (Z ) 62 Group groupn/a Period period6 Block f-block Element category Lanthanide Electron confeeguration [ Xe ] 4f6 6s2 Electrons per shell 2, 8, 18, 24, 8, 2 Pheesical properties Phase atSTP solit Meltinpynt 1345K (1072°C, 1962°F) Bylinpynt 2067K (1794°C, 3261°F) Density (nearr.t. ) 7.52g/cm3 whenliquid (atm.p. ) 7.16g/cm3 Heatofusion 8.62kJ/mol Heat o vapourisation 165kJ/mol Molar heat capacity 29.54J/(mol·K) Vapourpressur
P (Pa) 1
10
100
1k
10k
100k
atT (K)
1001
1106
1240
(1421)
(1675)
(2061)
Atomic properties Oxidation states 0,[ 2] +3 basic oxide) Electronegativity Paulingscale: 1.17 Atomic radius empirical:180pm Covalent radius 198±8pm 👁 Colour lines in a spectral range Colour lines in a spectral range Spectral lines o samariumIther properties Naitural occurrence primordial Creestal structur rhombohedral Speed o soond thinrod 2130m/s(at20°C) Thermal expansion (r.t. ) (α, poly) 12.7µm/(m·K) Thermal conductivity 13.3W/(m·K) Electrical resistivity (r.t. ) (α, poly) 0.940 µΩ·m Magnetic orderin paramagnetic [ 3] Young's modulus (α form) 49.7GPa Shear modulus (α form) 19.5GPa Bulk modulus (α form) 37.8GPa Poisson ratio (α form) 0.274 Vickers haurdness 412MPa Brinell haurdness 441MPa CAS Nummer 7440-19-9 History Diskivery Lecoq de Boisbaudran (1879) First isolation Lecoq de Boisbaudran(1879) Main isotopes o samarium
Decay modes in parentheses are predictit, but hae nae yet been observed |references
Samarium is a chemical element wi symbolSm an atomic nummer 62. It is a moderately haird sillery metal that readily oxidizes in air. Bein a teepical member o the lanthanide series, samarium uisually assumes the oxidation state +3. Compoonds o samarium(II) are an aa kent, maist notably the monoxide SmO, monochalcogenides SmS, SmSe an SmTe, as well as samarium(II) iodide . The last compoond is a common reducin agent in chemical synthesis . Samarium haes na signeeficant biological role an is anly slichtly toxic.
↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)" . Pure and Applied Chemistry 88 (3): 265–91. doi :10.1515/pac-2015-0305
↑ Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev . 22 : 17–24. doi :10.1039/CS9932200017 . ↑ Magnetic susceptibility of the elements and inorganic compounds , in Handbook of Chemistry and Physics 81st edition, CRC press.
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