Properties of Promethium (Pm)
Promethium is a chemical element with the symbol (Pm) and atomic number 61. It is a rare and radioactive element belonging to the lanthanide series of the periodic table. Promethium does not have stable isotopes and is typically found in trace amounts in uranium ores.
The following table provides a comprehensive list of promethium (Pm) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Crystal Structure | Double hexagonal close-packed (dhcp) |
| Atomic Number | 61 |
| Molar Mass | 145 g/mol |
| Density | 7260 kg/m3 |
| Mechanical Properties | Metric |
| Young’s Modulus (E) | 46 GPa |
| Shear Modulus (G) | 18 GPa |
| Bulk Modulus (K) | 33 GPa |
| Poisson’s Ratio (ν) | 0.28 |
| Thermal Properties | Metric |
| Melting Point | 1042 °C |
| Boiling Point | 3000 °C |
| Thermal Conductivity (27°C) | 15 W/m·K |
| Specific Heat Capacity (Cp) (25°C) | 190 J/kg·K |
| Coefficient of Thermal Expansion (αL) (25°C) | 1.1×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Resistivity | 7.5×10-5 Ω·cm |
Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) A.M. Howatson, P.G. Lun, J.D. Todd, P.D. Engineering Tables and Data. United Kingdom: University of Oxford, Department of Engineering Science, 2009.