Template:Infobox promethium

{{Infobox element

|image name=

|symbol =Pm

|Z =61

|number =61

|name =promethium

|abundance=

|abundance in earth's crust=

|abundance in oceans=

|abundance in solar system=

|left=neodymium

|right=samarium

|above=–

|below=Np

|appearance=metallic

|electrons per shell=2, 8, 18, 23, 8, 2

|phase=

|density=α-¹⁴⁵Pm: 7.149 g/cm³
α-¹⁴⁷Pm: 7.247 g/cm³ 

|density conditions=(at 20° C)

|density gpcm3nrt=

|melting point K=1315

|melting point C=1042

|melting point F=1908

|boiling point K=3273

|boiling point C=3000

|boiling point F=5432

|heat fusion=7.13

|heat vaporization=289

|crystal structure=double hexagonal close packed

|crystal structure Pearson symbol=hP4

|lattice constants=a = 0.36393 pm
c = 1.1739 pm (at 20 °C){{cite book |last=Arblaster |first= John W. |title=Selected Values of the Crystallographic Properties of Elements |publisher=ASM International |publication-place=Materials Park, Ohio |date=2018 |isbn=978-1-62708-155-9}}

|electronegativity=1.13

|electronegativity comment=(?)

|number of ionization energies=3

|ionization energy 1=540

|ionization energy 2=1050

|ionization energy 3=2150

|atomic radius=183

|covalent radius=199

|magnetic ordering=paramagnetic

|magnetic ordering ref={{cite book |url=https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf|chapter=Magnetic susceptibility of the elements and inorganic compounds| editor = Lide, D. R. | title = CRC Handbook of Chemistry and Physics | edition = 86th | location = Boca Raton (FL) | publisher = CRC Press | year = 2005 | isbn = 0-8493-0486-5 }}

|electrical resistivity unit prefix=µ

|electrical resistivity=est. 0.75

|electrical resistivity comment=(at {{abbr|r.t.|room temperature}})

|thermal conductivity=17.9

|thermal expansion=

|thermal expansion comment={{val|9.0|e=−6}}/K (at r.t.){{cite book|author=Cverna, Fran |title=ASM Ready Reference: Thermal properties of metals |date=2002 |publisher=ASM International |isbn=978-0-87170-768-0 |url=http://www.owlnet.rice.edu/~msci301/ThermalExpansion.pdf |chapter=Ch. 2 Thermal Expansion}}{{efn|text=The thermal expansion of Pm is anisotropic: the parameters for each crystal axis (at 20 °C) are α_a = {{val|11.1|e=−6}}/K, α_c = {{val|15.0|e=−6}}/K, and α_average = α_V/3 = {{val|12.4|e=−6}}/K.}}

|magnetic susceptibility=

|magnetic susceptibility ref=

|Young's modulus=α form: est. 46

|Shear modulus=α form: est. 18

|Bulk modulus=α form: est. 33

|Poisson ratio=α form: est. 0.28

|CAS number=7440-12-2

|naming=derived from Prometheus, the Titan in Greek mythology

|discovered by=Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin

|discovery date=1945

|first isolation by=F. Weigel

|first isolation date=1963

|named by=Grace Mary Coryell

|named date=1945

|QID=Q1809

}}

{{Infobox element/element navigation|symbol=Pm}}