د ويکيپېډيا، وړیا پوهنغونډ له خوا
Samarium, 62Sm |
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Pronunciation | /səˈmɛəriəm/ sə-MAIR-ee-əm |
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Appearance | silvery white |
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اټومي شمیره (Z) | 62 |
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گروپ, پیریود | group n/a, period 6 |
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بلاک | f-block |
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Element category | lanthanide |
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معياري اټومي وزن (Ar) | کينډۍ:Val[۱] |
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Electron configuration | [Xe] 4f6 6s2 |
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Electrons per shell | 2, 8, 18, 24, 8, 2 |
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حالت (at STP) | جامد |
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دويلې کيدو ټکى | 1345 K (1072 °C, 1962 °F) |
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يشنا ټکی | 2173 K (1900 °C, 3452 °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 of fusion | 8.62 kJ/mol |
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Heat of vaporization | 192 kJ/mol |
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Molar heat capacity | 29.54 J/(mol·K) |
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Vapor pressure
P (Pa)
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1
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10
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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)
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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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Oxidation states | 4, 3, 2, 1 (a mildly basic oxide) |
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Electronegativity | Pauling scale: 1.17 |
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Ionization energies | - 1st: 544.5 kJ/mol
- 2nd: 1070 kJ/mol
- 3rd: 2260 kJ/mol
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Atomic radius | empirical: 180 pm |
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Covalent radius | 198±8 pm |
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Crystal structure | rhombohedral |
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Speed of sound 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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د تودوخې تېرېدنه | 13.3 W/(m·K) |
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Electrical resistivity | (r.t.) (α, poly) 0.940 µΩ·m |
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Magnetic ordering | paramagnetic[۲] |
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Magnetic susceptibility (χmol) | +1860.0·10−6 cm3/mol (291 K)[۳] |
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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 hardness | 410–440 MPa |
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Brinell hardness | 440–600 MPa |
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CAS Number | 7440-19-9 |
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Naming | after the mineral samarskite (itself named after Vasili Samarsky-Bykhovets) |
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Discovery and first isolation | Lecoq de Boisbaudran (1879) |
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| references | in Wikidata |
ساماريوم (په انگرېزي: Samarium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Sm سمبول او ۶۲ اتمي شمېرې په وسیله ښودل شوی دی.
- ↑ Lua error in Module:Citation/CS1/Utilities at line 38: bad argument #1 to 'ipairs' (table expected, got nil).
- ↑ Lua error in Module:Citation/CS1/Utilities at line 38: bad argument #1 to 'ipairs' (table expected, got nil).
- ↑ Lua error in Module:Citation/CS1/Utilities at line 38: bad argument #1 to 'ipairs' (table expected, got nil).
دا ليکنه نابشپړه ده، تاسې ددې ليکنې په بشپړولو کې د ويکيپېډيا سره مرسته کولای شئ.
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