Protactinium element (Pa) is in period 7 of a periodic table. Protactinium is in the f-block and it is classified as an actinide on the periodic table.
There is a lot more information related to protactinium which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Protactinium element (Information Table)
- Protactinium element in Periodic table
- Facts about Protactinium
- Properties of Protactinium
- Uses of Protactinium
Protactinium Element (Information Table)
The important data related to protactinium element is given in the table below.
|Appearance of protactinium||Silvery white metallic appearance|
|Atomic number of protactinium||91|
|Symbol of protactinium||Pa|
|Atomic mass of protactinium||231.04 u|
|Protons, Neutrons & Electrons in protactinium||Protons: 91, Neutrons: 148, Electrons: 91|
|State of protactinium (at STP)||Solid|
|Period number of protactinium in periodic table||7|
|Block of protactinium in periodic table||f-block|
|Category of protactinium||Inner transition metals|
|Bohr model or Electrons per shell or Electrons arrangement in protactinium||2, 8, 18, 32, 20, 9, 2|
|Electron configuration of protactinium||[Rn] 5f2 6d1 7s2|
|Orbital diagram of protactinium|
|Electronegativity of protactinium (on pauling scale)||1.5|
|Atomic radius of protactinium (van der Waals radius)||243 picometers|
|Density of protactinium||15.37 g/cm3|
|1st ionization energy of protactinium||5.89 eV|
|Main isotope of protactinium||231Pa|
|Melting point of protactinium||1841 K or 1568 °C or 2854 °F|
|Boiling point of protactinium||4300 K or 4027 °C or 7280 °F|
|Crystal structure of protactinium||Tetragonal|
|Discovery of protactinium||By Kasimir Fajans in 1913|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Protactinium element in Periodic table
The Protactinium element (Pa) has the atomic number 91 and is located in period 7. Protactinium is a metal and it is classified as an actinide group element.
Click on above elements in the periodic table to see their information.
Facts about protactinium
Here are a few interesting facts about the protactinium element.
- Protactinium was given its name from the Greek word “protos” (meaning first) and “actinium”.
- The concentration of protactinium in the earth’s crust is around 0.1 parts per trillion (which is very very less).
- Protactinium is naturally obtained from uranium ores and these uranium ores contain protactinium in the concentration of 3 ppm.
- Protactinium is a radioactive as well as toxic metal.
Properties of protactinium
Here is a list of some physical properties and chemical properties of protactinium.
Physical properties of protactinium
- Protactinium has a silvery white appearance.
- Protactinium has tetragonal crystal structure.
- The melting point and boiling point of protactinium is 1841 K and 4300 K respectively.
- There are around 29 isotopes of protactinium and all these isotopes are radioactive in nature.
- The density of protactinium is 15.37 g/cm3 and its atomic mass is 231.04 amu.
Chemical properties of protactinium
- Protactinium is a toxic as well as radioactive element.
- There are different oxidation states of protactinium, but the most common oxidation state is +5.
- Protactinium does not show any reaction with alkalis, but it reacts with moisture, oxygen as well as acids.
Uses of protactinium
Protactinium is not used commercially because of its scarcity and radioactivity. It is generally used for research work.
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- Protactinium – Wikipedia. (2019, January 9). Protactinium – Wikipedia. https://en.wikipedia.org/wiki/Protactinium
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- Holden, et al. (2018, December 1). IUPAC Periodic Table of the Elements and Isotopes (IPTEI) for the Education Community (IUPAC Technical Report). Pure and Applied Chemistry, 90(12), 1833–2092. https://doi.org/10.1515/pac-2015-0703
- Zhang, et al. (2011, January 11). Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in Handbooks. Journal of Chemical & Engineering Data, 56(2), 328–337. https://doi.org/10.1021/je1011086
- Scerri, E. (2013, July 18). Element 91—Protactinium. A Tale of Seven Elements. https://doi.org/10.1093/oso/9780195391312.003.0008
- C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – PROTACTINIUM. (n.d.). C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – PROTACTINIUM. https://pubsapp.acs.org/cen/80th/protactinium.html?
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