From Wikipedia, the free encyclopedia
Protactinium, 91Pa
Microscope image of a sample of protactinium-233
Protactinium
Pronunciation /ˌprtækˈtɪniəm/ ( PROH-tak-TIN-ee-əm)
Appearancebright, silvery metallic luster
Standard atomic weight Ar°(Pa)
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
Group f-block groups (no number)
Period period 7
Block  f-block
Electron configuration[ Rn] 5f2 6d1 7s2
Electrons per shell2, 8, 18, 32, 20, 9, 2
Physical properties
Phase at  STP solid
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 occurrence from decay
Crystal structurebody-centered tetragonal [3]
Body-centered tetragonal crystal structure for protactinium
Thermal expansion~9.9 µm/(m⋅K) [4] (at  r.t.)
Thermal conductivity47 W/(m⋅K)
Electrical resistivity177 nΩ⋅m (at 0 °C)
Magnetic ordering paramagnetic [5]
CAS Number7440-13-3
History
Prediction Dmitri Mendeleev (1869)
Discovery and first isolation Kasimir Fajans and Oswald Helmuth Göhring (1913)
Named by Otto Hahn and Lise Meitner (1917–8)
Isotopes of protactinium
Main isotopes [6] 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 226Ac
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
Pa · Protactinium
Th ←

ibox Th

iso
91
Pa  [ e
IB-Pa [ e
IBisos [ e
→  U

ibox U

indexes by PT (page)
child table, as reused in {IB-Pa}
Main isotopes of protactinium
Main isotopes [6] 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 226Ac
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
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 (44) · (this table: )

References

  1. ^ "Standard Atomic Weights: Protactinium". CIAAW. 2017.
  2. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi: 10.1515/pac-2019-0603. ISSN  1365-3075.
  3. ^ Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica. 12 (9): 697. doi: 10.1107/S0365110X59002031.
  4. ^ Cverna, Fran, ed. (2002). "Chapter 2. Thermal Expansion". ASM Ready Reference: Thermal Properties of Metals (PDF). ASM International. p. 11. ISBN  0871707683.
  5. ^ 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.
  6. ^ a b 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.
From Wikipedia, the free encyclopedia
Protactinium, 91Pa
Microscope image of a sample of protactinium-233
Protactinium
Pronunciation /ˌprtækˈtɪniəm/ ( PROH-tak-TIN-ee-əm)
Appearancebright, silvery metallic luster
Standard atomic weight Ar°(Pa)
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
Group f-block groups (no number)
Period period 7
Block  f-block
Electron configuration[ Rn] 5f2 6d1 7s2
Electrons per shell2, 8, 18, 32, 20, 9, 2
Physical properties
Phase at  STP solid
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 occurrence from decay
Crystal structurebody-centered tetragonal [3]
Body-centered tetragonal crystal structure for protactinium
Thermal expansion~9.9 µm/(m⋅K) [4] (at  r.t.)
Thermal conductivity47 W/(m⋅K)
Electrical resistivity177 nΩ⋅m (at 0 °C)
Magnetic ordering paramagnetic [5]
CAS Number7440-13-3
History
Prediction Dmitri Mendeleev (1869)
Discovery and first isolation Kasimir Fajans and Oswald Helmuth Göhring (1913)
Named by Otto Hahn and Lise Meitner (1917–8)
Isotopes of protactinium
Main isotopes [6] 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 226Ac
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
Pa · Protactinium
Th ←

ibox Th

iso
91
Pa  [ e
IB-Pa [ e
IBisos [ e
→  U

ibox U

indexes by PT (page)
child table, as reused in {IB-Pa}
Main isotopes of protactinium
Main isotopes [6] 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 226Ac
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
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 (44) · (this table: )

References

  1. ^ "Standard Atomic Weights: Protactinium". CIAAW. 2017.
  2. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi: 10.1515/pac-2019-0603. ISSN  1365-3075.
  3. ^ Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica. 12 (9): 697. doi: 10.1107/S0365110X59002031.
  4. ^ Cverna, Fran, ed. (2002). "Chapter 2. Thermal Expansion". ASM Ready Reference: Thermal Properties of Metals (PDF). ASM International. p. 11. ISBN  0871707683.
  5. ^ 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.
  6. ^ a b 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.

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