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Template:Infobox promethium

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Revision as of 13:35, 7 April 2026 by imported>I3rwiiwjiwji (I feel like we should use the image of (pure) Promethium solution as a placeholder until we find an actual image (btw Neptunium is legal to own, apparently, and the Neptunium comes from NovaElements, which apparently sells Pure neptunium))
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Promethium, 61Pm
Template:Infobox element/symbol-to-top-image-alt
Promethium
PronunciationTemplate:Infobox element/pronunciation/format
Appearancemetallic
Mass number[145]
Promethium 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
–
↑
Pm
↓
Np
neodymium ← promethium → samarium
Atomic number (Z)61
Groupf-block groups (no number)
Periodperiod 6
Block  f-block
Electron configuration[Xe] 4f5 6s2
Electrons per shell2, 8, 18, 23, 8, 2
Physical properties
Phase at STPsolid
Melting point1315 K ​(1042 °C, ​1908 °F)
Boiling point3273 K ​(3000 °C, ​5432 °F)
Density (at 20° C)α-145Pm: 7.149 g/cm3
α-147Pm: 7.247 g/cm3 [1]
Heat of fusion7.13 kJ/mol
Heat of vaporization289 kJ/mol
Atomic properties
Oxidation statescommon: +3
+2[2]
ElectronegativityPauling scale: 1.13 (?)
Ionization energies
  • 1st: 540 kJ/mol
  • 2nd: 1050 kJ/mol
  • 3rd: 2150 kJ/mol
Atomic radiusempirical: 183 pm
Covalent radius199 pm
Color lines in a spectral range
Spectral lines of promethium
Other properties
Natural occurrencefrom decay
Crystal structure ​double hexagonal close-packed (dhcp) (hP4)
Lattice constantsa = 0.36393 nm
c = 1.1739 nm (at 20 °C)[1]
Thermal expansion9.0×10−6/K (at r.t.)[3][lower-alpha 1]
Thermal conductivity17.9 W/(m⋅K)
Electrical resistivityest. 0.75 µΩ⋅m (at r.t.)
Magnetic orderingparamagnetic[4]
Young's modulusα form: est. 46 GPa
Shear modulusα form: est. 18 GPa
Bulk modulusα form: est. 33 GPa
Poisson ratioα form: est. 0.28
CAS Number7440-12-2
History
Namingderived from Prometheus, the Titan in Greek mythology
DiscoveryJacob A. Marinsky, Lawrence E. Glendenin, Charles D. Coryell (1945)
First isolationF. Weigel (1963)
Named byGrace Mary Coryell (1945)
Isotopes of promethium
Main isotopes[5] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
143Pm synth 265 d ε 143Nd
144Pm synth 363 d ε 144Nd
145Pm synth 17.7 y ε 145Nd
α 141Pr
146Pm synth 5.53 y ε 146Nd
β− 146Sm
147Pm trace 2.6234 y β− 147Sm
File:Symbol category class.svg Category: Promethium
| references

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Notes

  1. ↑ The thermal expansion of Pm is anisotropic: the parameters for each crystal axis (at 20 °C) are αa = 11.1×10−6/K, αc = 15.0×10−6/K, and αaverage = αV/3 = 12.4×10−6/K.[1]

References

  1. ↑ 1.0 1.1 1.2 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
  2. ↑ Pm(II) has been observed in molten salts, see Mikheev, N.B.; Spitsyn, V.I.; Auerman, L.N.; Rumer, I.A.; D'yachkova, R.A. (1978). "Низшие состояния окисления актиноидных и лантаноидных элементов в расплавленных солях / Lower oxidation states of actinide and lanthanide elements in molten salts". Радиохимия / Soviet Radiochemistry (in русский). 18 (4): 556–559.
  3. ↑ Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.
  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.