Template:Infobox promethium

	child table, as reused in {IB-Pm} v; e; h;
Main isotopes of promethium
α	141Pr
β−	146Sm

Promethium, ₆₁Pm
Promethium
Pronunciation	/proʊˈmiːθiəm/ (proh-MEE-thee-əm)
Appearance	metallic
Mass number	[145]
Promethium in the periodic table
	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
	Spectral lines of promethium
Other properties
Natural occurrence	from decay
Crystal structure	double hexagonal close-packed (dhcp) (hP4)
Lattice constants	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
Naming	derived from Prometheus, the Titan in Greek mythology
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 v; e;
α	141Pr
β−	146Sm
	Category: Promethium; view; talk; edit; \| references

Pm · Promethium
Nd ← ibox Nd	^iso ₆₁Pm [e] IB-Pm [e] IBisos [e]	→ Sm ibox Sm
cat:Pm (5) cat:Pm-isotopes (68) Commons Wikidata:Q1809 Wiktionary
indexes by PT (page) v e

Data sets read by {{Infobox element}}
Name and identifiers	view edit
Symbol etymology (11 non-trivial)	view edit
Top image (caption, alt)	caption: view edit alt: view edit
Pronunciation	view edit
Allotropes (overview)	view edit
Group (overview)	view edit
Period (overview)	view edit
Block (overview)	view edit
Natural occurrence	view edit
Phase at STP	view edit
Oxidation states	view edit
Spectral lines image	view edit
Electron configuration (cmt, ref)	view edit
Isotopes
Standard atomic weight	view edit
most stable isotope	view edit
Wikidata
Wikidata *	view edit
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (46) · (this table: v )

^ ^a ^b ^c Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
^ Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.
^ 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.
^ ^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.
^ ^a ^b "¹⁴⁶Pm ε decay" (PDF). NNDC Chart of Nuclides.

Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

[Arblaster_2018-1] Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.

[2] Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.

[magnet-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.

[NUBASE2020-5] 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.

[Pm146-no-beta-plus-6] "¹⁴⁶Pm ε decay" (PDF). NNDC Chart of Nuclides.

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