Samarium (Sm) is a chemical element of the periodic table, located in the period 6, and has the atomic number 62. It is the sixth element in the lanthanide series. It is a silvery-white metal, which is named after Colonel Samarsky, a Russian mine official. It is a highly reactive metal and is counted as one of the rare earth elements.
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| – f block |
FAQs on Samarium Element
| Samarium |
|---|
| ‣ What does samarium look like? Appearance: silvery white |
| ‣ Who discovered samarium? When was samarium discovered? Discovery and first isolation: Lecoq de Boisbaudran (1879) |
‣ Where is samarium found on the periodic table? Location: Samarium is found in the sixth row of the periodic table, next to the promethium element. |
| ‣ What is samarium atomic mass number? Atomic number (Z): 62 |
| ‣ What’s the symbol for samarium? Symbol: Sm |
| ‣ Samarium atomic weight: 150.36 |
| ‣ What block is samarium in the periodic table? Block: f-block |
| ‣ What period is samarium in on the periodic table? Period: 6 |
| ‣ Samarium atomic radius: empirical: 180 pm |
| ‣ Samarium covalent radius: 198±8 pm |
| ‣ What is samarium melting point? Melting point: 1345 K (1072 °C, 1962 °F) |
| ‣ What is samarium boiling point? Boiling point: 2713 K (1900 °C, 3452 °F) |
| ‣ How many shells does samarium have? Electrons per shell: 2, 8, 18, 24, 8, 2 |
| ‣ What is the electron configuration of samarium? Electron configuration: [Xe] 4f6 6s2 |
| ‣ Samarium ionization energies: 1st: 544.5 kJ/mol 2nd: 1070 kJ/mol 3rd: 2260 kJ/mol |
| ‣ What is the phase of samarium? Phase (at r.t): solid |
| ‣ Samarium density (near r.t): 7.52 g/cm3 when liquid (at m.p): 7.16 g/cm3 |
| ‣ Samarium magnetic ordering: paramagnetic |
| ‣ Samarium natural occurrence: primordial |
| ‣ What is the oxidation state of samarium? Oxidation state: +2, +3 |
| ‣ What’s the electronegativity of samarium? Electronegativity: Pauling scale: 1.17 |
| ‣ Samarium poisson’s ratio: α form: 0.274 |
| ‣ Samarium heat of fusion: 8.62 kJ/mol |
| ‣ Samarium heat of vaporization: 192 kJ/mol |
| ‣ Samarium molar heat capacity: 29.54 J/(mol K) |
| ‣ Samarium molar magnetic susceptibility: +1860 × 10-6 cm3/mol (291 K) |
| ‣ Speed of sound in samarium: 2130 m/s (at 20 °C) |
| ‣ What is the crystal structure of samarium? Crystal structure: rhombohedral |
| ‣ Thermal expansion of samarium: (r.t) (α, poly) 12.7 µm/(m.K) |
| ‣ Thermal conductivity of samarium: 13.3 W/(m.K) |
| ‣ Samarium electrical resistivity: (r.t) (α, poly) 0.940 µΩ.m |
| ‣ Samarium hardness Vickers hardness: 410-440 MPa Brinell hardness: 440-600 MPa |
| ‣ Young’s modulus of samarium: α form: 49.7 GPa |
| ‣ Shear modulus of samarium: α form: 19.5 GPa |
| ‣ Bulk modulus of samarium: α form: 37.8 GPa |
| ‣ Samarium CAS number: 7440-19-9 |
‣ Samarium vapor pressure
| Vapor pressure | ||||||
|---|---|---|---|---|---|---|
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| at T (K) | 1001 | 1106 | 1240 | (1421) | (1675) | (2061) |
‣ How many isotopes does samarium have?
| Main isotopes of samarium | ||||
|---|---|---|---|---|
| Isotope | Abundance | Half-life (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 | ||
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