Template:Infobox promethium

Promethium, ₆₁Pm

Promethium
Pronunciation	/proʊˈmiːθiəm/ ​(proh-MEE-thee-əm)
Appearance	metallic
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
Group	f-block groups (no number)
Period	period 6
Block	f-block
Electron configuration	[Xe] 4f5 6s2
Electrons per shell	2, 8, 18, 23, 8, 2
Physical properties
Phase at STP	solid
Melting point	1315 K ​(1042 °C, ​1908 °F)
Boiling point	3273 K ​(3000 °C, ​5432 °F)
Density (at 20° C)	α-145Pm: 7.149 g/cm3 α-147Pm: 7.247 g/cm3
Heat of fusion	7.13 kJ/mol
Heat of vaporization	289 kJ/mol
Atomic properties
Oxidation states	common: +3 +2?
Electronegativity	Pauling scale: 1.13 (?)
Ionization energies	1st: 540 kJ/mol 2nd: 1050 kJ/mol 3rd: 2150 kJ/mol
Atomic radius	empirical: 183 pm
Covalent radius	199 pm
Color lines in a spectral range Spectral lines of promethium
Other properties
Natural occurrence	from decay
Crystal structure	​double hexagonal close-packed (dhcp) (hP4)
Lattice constants	Double hexagonal close packed crystal structure for promethium a = 0.36393 pm c = 1.1739 pm (at 20 °C)
Thermal expansion	9.0×10−6/K (at r.t.)
Thermal conductivity	17.9 W/(m⋅K)
Electrical resistivity	est. 0.75 µΩ⋅m (at r.t.)
Magnetic ordering	paramagnetic
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 Number	7440-12-2
History
Discovery	Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin (1945)
First isolation	F. Weigel (1963)
Named by	Grace Mary Coryell (1945)
Isotopes of promethium
Main isotopes Decay 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

Pm · Promethium
Nd ← ibox Nd	iso 61 Pm  [] IB-Pm [] IBisos []	→ Sm ibox Sm
File:Symbol category class.svg cat:Pm (0) File:Symbol category class.svg cat:Pm-isotopes (0) File:Commons-logo.svg Commons File:Wikidata-logo.svg Wikidata:Q1809 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page)

child table, as reused in {IB-Pm}
Main isotopes of promethium
Main isotopes Decay 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

Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)	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
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Wikidata *
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: )

References

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