Promethium information, including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.
Promethium is a Block F, Group 3, Period 6 element. The electronic configuration is [Xe] 4f5 6s2. In its elemental form promethium's CAS number is 7440-12-2. The promethium atom has a radius of 183.4.pm and it's Van der Waals radius is 200.pm. Promethium was discovered by J. A. Marinsky, Lawrence Glendenin and Charles D. Coryell in 1945.
Promethium Abundance. The following table shows the abundance of promethium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope. |
prométhium
Promethium
prometio
Promécio
prometio
PrometiumIsotope |
Atomic Mass |
% Abundance on Earth |
Pm-143 |
142.910928 |
- |
Pm-145 |
144.912744 |
- |
Pm-147 |
146.915134 |
- |
Promethium Safety Data.
The safety data for promethium metal, nanoparticles and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the left margin.
Ionization Energy. The ionization energy for promethium (the least required energy to release a single electron from the atom in it's ground state in the gas phase) is stated in the following table: |
1st Ionization Energy |
538.39 kJ mol-1 |
2nd Ionization Energy |
1051.70 kJ mol-1 |
3rd Ionization Energy |
2151.64 kJ mol-1 |
Conductivity. As to
promethium's electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @
20 ºC is - µOcm and its electronegativities (or its ability to draw electrons relative to other elements) is
-. The thermal conductivity of
promethium is 17.9 W m-1 K-1.
Thermal Properties of Promethium. The melting point and boiling point for promethium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization. |
Heat of Fusion |
12.6 kJ mol-1 |
Heat of Vaporization |
- kJ mol-1 |
Heat of Atomization |
308 kJ mol-1 |
| Formula | Atomic Number | Molecular Weight | Electronegativity (Pauling) | Density | Melting Point | Boiling Point |
Vanderwaals radius |
Ionic radius | Energy of first ionization |
| Pm | 61 | [145](0) g.mol -1 | - | 7.26 g/L | 1042 °C | 3000 °C | .200 nm | - pm | 538.39 kJ.mol-1 |
| PRODUCT CATALOG | U.S. Operations | Submicron & Nanopowder | Tolling | Ultra High Purity | Sputtering Target | Crystal Growth | Rod, Plate, Powder, etc. | Foil |
