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Samarium |
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Pronunciation | (sə-MAIR-ee-əm) |
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Appearance | sillery white |
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Standard atomic weight Ar, std(Sm) | 7002150360000000000♠150.36(2)[1] |
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Mass number | Sm: |
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Samarium in the periodic cairt |
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Atomic nummer (Z) | 62 |
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Group | group n/a |
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Period | period 6 |
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Block | f-block |
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Element category | Lanthanide |
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Electron confeeguration | [Xe] 4f6 6s2 |
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Electrons per shell | 2, 8, 18, 24, 8, 2 |
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Pheesical properties |
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Phase at STP | solit |
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Meltin pynt | 1345 K (1072 °C, 1962 °F) |
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Bylin pynt | 2067 K (1794 °C, 3261 °F) |
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Density (near r.t.) | 7.52 g/cm3 |
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when liquid (at m.p.) | 7.16 g/cm3 |
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Heat o fusion | 8.62 kJ/mol |
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Heat o vapourisation | 165 kJ/mol |
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Molar heat capacity | 29.54 J/(mol·K) |
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Vapour pressur
P (Pa)
|
1
|
10
|
100
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1 k
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10 k
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100 k
|
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at T (K)
|
1001
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1106
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1240
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(1421)
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(1675)
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(2061)
|
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Atomic properties |
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Oxidation states | 0,[2] +1, +2, +3 (a mildly basic oxide) |
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Electronegativity | Pauling scale: 1.17 |
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Atomic radius | empirical: 180 pm |
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Covalent radius | 198±8 pm |
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Spectral lines o samarium |
Ither properties |
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Naitural occurrence | Sm: Primordial |
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Creestal structur | rhombohedral |
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Speed o soond thin rod | 2130 m/s (at 20 °C) |
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Thermal expansion | (r.t.) (α, poly) 12.7 µm/(m·K) |
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Thermal conductivity | 13.3 W/(m·K) |
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Electrical resistivity | (r.t.) (α, poly) 0.940 µ Ω·m |
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Magnetic orderin | paramagnetic[3] |
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Young's modulus | (α form) 49.7 GPa |
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Shear modulus | (α form) 19.5 GPa |
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Bulk modulus | (α form) 37.8 GPa |
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Poisson ratio | (α form) 0.274 |
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Vickers haurdness | 412 MPa |
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Brinell haurdness | 441 MPa |
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CAS Nummer | 7440-19-9 |
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History |
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Diskivery | Lecoq de Boisbaudran (1879) |
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First isolation | Lecoq de Boisbaudran (1879) |
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Main isotopes o samarium |
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Decay modes in parentheses are predictit, but hae nae yet been observed |
| references |