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Protactinium information, including Technical Data, Safety Data and its 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.


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Protactinium ist ein Block F, Gruppe 3, Periode 7 Element. Die elektronische Konfiguration [Rn] 5f2 6d1 7s2. In seiner elementaren Form Protactinium's CAS 7440-13-3 Die Zahl ist Protactinium Atom hat einen Radius von und es ist, Van der Waals Radius ist

Protactinium wurde von Otto Hahn und Lise Meitner 1917.



Frenchprotactinium German Protactinium Italian protoattinio PortugueseProtacnídio Spanish protactinio Swedish Protaktinium

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.

Atomic Mass
% Abundance on Earth

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.

Ionisation Energie. Die Ionisierungenergie für protactinium (die am wenigsten Energie benötigt, um ein einzelnes Elektron aus dem Atom in seinem Grundzustand in der Gasphase) ist in der folgenden Tabelle dargestellt:

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 German Operations Submicron & Nanopowder Tolling Ultra High Purity Sputtering Target Crystal Growth Rod, Plate, Powder, etc. Foil
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Recent Research & Development for Protactinium

  • Theoretical study on molecular property of protactinium(V) and uranium(VI) oxocations: why does protactinium(V) form monooxo cations in aqueous solution? J Phys Chem A. 2006 Dec 14;110(49):13303-9.

  • Oxidation of gas-phase protactinium ions, Pa+ and Pa2+: formation and properties of PaO2(2+)(g), protactinyl. J Phys Chem A. 2006 May 4;110(17):5751-9.

  • Decay Data Evaluation Project (DDEP): evaluation of the main 233Pa decay characteristics. Appl Radiat Isot. 2006 Oct-Nov;64(10-11):1403-11. Epub 2006 Mar 29.

  • Radiation protection potential of MOX-fuel doped with 231Pa and Cs radioisotopes. Radiat Prot Dosimetry. 2005;115(1-4):302-5.

  • First structural characterization of a protactinium(V) single oxo bond in aqueous media. Inorg Chem. 2005 Dec 12;44(25):9542-6.

  • Preliminary results on the immobilisation of radionuclides from waters with specific adsorbers based on phosphate salts. Ann Chim. 2004 Nov;94(11):817-28.

  • Measurement of femtogram quantities of protactinium in silicate rock samples by multicollector inductively coupled plasma mass spectrometry. Anal Chem. 2004 Jul 1;76(13):3584-9.

  • Analysis of the 237Np-233Pa photon spectrum using the full response function method. Appl Radiat Isot. 2004 Feb-Apr;60(2-4):239-46.

  • Radioactive waste forms stabilized by ChemChar gasification: characterization and leaching behavior of cerium, thorium, protactinium, uranium, and neptunium. Chemosphere. 2004 Feb;54(7):873-85.

  • [Study on pollution for the photoelectronic material InP] Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Aug;22(4):550-1. Chinese.


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