Protactinium 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.
Protactinium is a Block F, Group 3, Period 7 element. The electronic configuration is [Rn] 5f2 6d1 7s2. In its elemental form protactinium's CAS number is 7440-13-3 The protactinium atom has a radius of 156.1.pm and it's Van der Waals radius is 200.pm. Protactinium was discovered by Otto Hahn and Lise Meitner in 1917.
Protactinium Abundance. The following table shows the abundance of protactinium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope. |
protactinium
Protactinium
protoattinio
Protacnídio
protactinio
ProtaktiniumIsotope |
Atomic Mass |
% Abundance on Earth |
Pa-231 |
231.035879 |
- |
Protactinium Safety Data.
The safety data for protactinium 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 protactinium (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 |
568.30 kJ mol-1 |
2nd Ionization Energy |
- kJ mol-1 |
3rd Ionization Energy |
- kJ mol-1 |
Conductivity. As to
protactinium's electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @
20 ºC is 19.1 µOcm and its electronegativities (or its ability to draw electrons relative to other elements) is
1.5. The thermal conductivity of
protactinium is 4.7 W m-1 K-1.
Thermal Properties of Protactinium. The melting point and boiling point for protactinium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization. |
Heat of Fusion |
16.7 kJ mol-1 |
Heat of Vaporization |
481 kJ mol-1 |
Heat of Atomization |
607 kJ mol-1 |
| Formula | Atomic Number | Molecular Weight | Electronegativity (Pauling) | Density | Melting Point | Boiling Point |
Vanderwaals radius |
Ionic radius | Energy of first ionization |
| Pa | 91 | 231 g.mol -1 | 1.5 | 15.37 g/L | -111.7 °C | 1568 °C | .200 nm | - pm | 568.30 kJ.mol-1 |
| PRODUCT CATALOG | U.S. Operations | Submicron & Nanopowder | Tolling | Ultra High Purity | Sputtering Target | Crystal Growth | Rod, Plate, Powder, etc. | Foil |
