
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 |
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‣ 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 | ||||||
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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 | ||||
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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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