Template:Infobox protactinium

Protactinium, 91Pa
Protactinium
Pronunciation/ˌprtækˈtɪniəm/ (PROH-tak-TIN-ee-əm)
Appearancebright, silvery metallic luster
Standard atomic weight Ar°(Pa)
231.03588(1)[1]
Protactinium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Pr

Pa

(Uqp)
thoriumprotactiniumuranium
Atomic number (Z)91
Groupf-block groups (no number)
Periodperiod 7
Block  f-block
Electron configuration[Rn] 5f2 6d1 7s2
Electrons per shell2, 8, 18, 32, 20, 9, 2
Physical properties
Phase at STPsolid
Melting point1841 K ​(1568 °C, ​2854 °F)
Boiling point4300 K ​(4027 °C, ​7280 °F) (?)
Density (near r.t.)15.37 g/cm3
Heat of fusion12.34 kJ/mol
Heat of vaporization481 kJ/mol
Atomic properties
Oxidation states+2, +3, +4, +5 (a weakly basic oxide)
ElectronegativityPauling scale: 1.5
Ionization energies
  • 1st: 568 kJ/mol
Atomic radiusempirical: 163 pm
Covalent radius200 pm
Color lines in a spectral range
Spectral lines of protactinium
Other properties
Natural occurrencefrom decay
Crystal structurebody-centered tetragonal[2]
Body-centered tetragonal crystal structure for protactinium
Thermal expansion~9.9 µm/(m⋅K)[3] (at r.t.)
Thermal conductivity47 W/(m⋅K)
Electrical resistivity177 nΩ⋅m (at 0 °C)
Magnetic orderingparamagnetic[4]
CAS Number7440-13-3
History
PredictionDmitri Mendeleev (1869)
Discovery and first isolationKasimir Fajans and Oswald Helmuth Göhring (1913)
Named byOtto Hahn and Lise Meitner (1917–8)
Isotopes of protactinium
Main isotopes[5] Decay
abun­dance half-life (t1/2) mode pro­duct
229Pa synth 1.5 d ε 229Th
230Pa synth 17.4 d β+ 230Th
β 230U
α 227Ac
231Pa 100% 3.265×104 y α 227Ac
232Pa synth 1.32 d β 232U
233Pa trace 26.975 d β 233U
234Pa trace 6.70 h β 234U
234mPa trace 1.159 min β 234U
 Category: Protactinium
| references
Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
  most stable isotope
Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01)
See also {{Index of data sets}} · Cat:data sets (11) · (this table: )

References

  1. "Standard Atomic Weights: Protactinium". CIAAW. 2017.
  2. Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica. 12 (9): 697. doi:10.1107/S0365110X59002031.
  3. Cverna, Fran, ed. (2002). "Chapter 2. Thermal Expansion". ASM Ready Reference: Thermal Properties of Metals (PDF). ASM International. p. 11. ISBN 0871707683.
  4. Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
  5. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.