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.
چټک مالومات عمومي خواص, Pronunciation ...
Samarium, 62Sm |
|
| Pronunciation | /səˈmɛəriəm/
sə-MAIR-ee-əm |
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| Appearance | silvery white |
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|
|
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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) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
1001 |
1106 |
1240 |
(1421) |
(1675) |
(2061) |
|
|
| 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 Rhombohedral crystal structure for samarium |
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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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|
| آيسوټوپ |
Abundance |
نیم ژوند (t1/2) |
Decay mode |
Product |
| 144Sm |
3.08% |
stable |
| 145Sm |
syn |
340 d |
ε |
145Pm |
| 146Sm |
syn |
6.8×107 y |
α |
142Nd |
| 147Sm |
15.00% |
1.06×1011 y |
α |
143Nd |
| 148Sm |
11.25% |
7×1015 y |
α |
144Nd |
| 149Sm |
13.82% |
stable |
| 150Sm |
7.37% |
stable |
| 151Sm |
syn |
90 y |
β− |
151Eu |
| 152Sm |
26.74% |
stable |
| 153Sm |
syn |
46.284 h |
β− |
153Eu |
| 154Sm |
22.74% |
stable |
|
| | references | in Wikidata |
تړل
