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Reference
|
Samarium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Sm | 62 | 150.36 | 1072 °C | 1794 °C | Solid | 7.52 g/cm3 | Metal |
|
|
|
| General |
| Name, Symbol, Number |
samarium, Sm, 62 |
| Chemical series |
lanthanides |
| Group, Period, Block |
n/a, 6, f |
| Appearance |
silvery white
 |
| Standard atomic weight |
150.36(2) g·mol−1 |
| Electron configuration |
[Xe] 4f6 6s2 |
| Electrons per shell |
2, 8, 18, 24, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
7.52 g·cm−3 |
| Liquid density at m.p. |
7.16 g·cm−3 |
| Melting point |
1345 K
(1072 °C, 1962 °F) |
| Boiling point |
2067 K
(1794 °C, 3261 °F) |
| Heat of fusion |
8.62 kJ·mol−1 |
| Heat of vaporization |
165 kJ·mol−1 |
| Heat capacity |
(25 °C) 29.54 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
1001 |
1106 |
1240 |
(1421) |
(1675) |
(2061) |
|
| Atomic properties |
| Crystal structure |
rhombohedral |
| Oxidation states |
3
(mildly basic oxide) |
| Electronegativity |
1.17 (scale Pauling) |
Ionization energies
(more) |
1st: 544.5 kJ·mol−1 |
| 2nd: 1070 kJ·mol−1 |
| 3rd: 2260 kJ·mol−1 |
| Atomic radius |
185 pm |
| Atomic radius (calc.) |
238 pm |
| Miscellaneous |
| Magnetic ordering |
antiferromagnetic |
| Electrical resistivity |
(r.t.) (α, poly) 0.940 µΩ·m |
| Thermal conductivity |
(300 K) 13.3 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (α, poly)
12.7 µm/(m·K) |
| Speed of sound (thin rod) |
(20 °C) 2130 m/s |
| 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 |
412 MPa |
| Brinell hardness |
441 MPa |
| CAS registry number |
7440-19-9 |
| Selected isotopes |
|
|
| References |
|
Samarium Compounds
|
Source: Wikipedia article Samarium
|
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Chemistry Quick Facts
