Plantilya:Infobox promethium

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General properties
Name, simbolo, kaiphan promethium, Pm, 61
Pronunciation /prˈmθiəm/
Element category puthaw nga lantanido
Group, period, block [[group {{{group}}} element|{{{group}}}]], 6, f
Standard atomic weight [145]
Electron configuration [Xe] 6s2 4f5
2, 8, 18, 23, 8, 2
Electron shells of promethium (2, 8, 18, 23, 8, 2)
Discovery Chien Shiung Wu, Emilio Segrè, Hans Bethe (1942)
First isolation Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin, Harold G. Richter (1945)
Named by Grace Mary Coryell (1945)
Physical properties
Phase magahi
Density (near r.t.) 7.26 g·cm−3
Melting point 1315 K, 1042 °C, 1908 °F
Boiling point 3273 K, 3000 °C, 5432 °F
Heat of fusion 7.13 kJ·mol−1
Heat of vaporization 289 kJ·mol−1
Atomic properties
Oxidation states 3 (mildly basic oxide)
Electronegativity  ? 1.13 (Pauling scale)
Ionization energies 1st: 540 kJ·mol−1
2nd: 1050 kJ·mol−1
3rd: 2150 kJ·mol−1
Atomic radius 183 pm
Covalent radius 199 pm
Crystal structure hexagonal
Promethium has a hexagonal crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) est. 0.75 µΩ·m
Thermal conductivity 17.9 W·m−1·K−1
Thermal expansion (r.t.) (α, poly)
est. 11 µm/(m·K)
Young's modulus (α form) est. 46 GPa
Shear modulus (α form) est. 18 GPa
Bulk modulus (α form) est. 33 GPa
Poisson ratio (α form) est. 0.28
CAS registry number 7440-12-2
Most stable isotopes
Main article: Isotopes of promethium
iso NA half-life DM DE (MeV) DP
145Pm syn 17.7 y ε 0.163 145Nd
146Pm syn 5.53 y ε 1.472 146Nd
β 1.542 146Sm
147Pm trace 2.6234 y β 0.224 147Sm
· r

Plantilya:Template reference list

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.