text: # Praseodymium
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Praseodymium sê siŏh cṳ̄ng gĭng-sṳ̆k, iâ sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 59, huá-hŏk hù-hô̤ sê Pr.
  
title: Praseodymium
wikitext: {{twinLAT|鐠}}
  {{Infobox element
  |number=59
  |symbol=Pr
  |name=Praseodymi
  |laname=praseodymium
  |left=[[cerium|ceri]]
  |right=[[neodymium|Neodymi]]
  |above=–
  |below=[[protactinium|Protactini]]
  |series=lanthanum-hiê
  |period=6
  |group=n/a
  |block=f
  |image name=Praseodymium.jpg
  |appearance=grayish white
  |atomic mass=140.90766
  |atomic mass ref=<ref name="IUPAC">[http://www.ciaaw.org/atomic-weights.htm Standard Atomic Weights 2013]. [[Commission on Isotopic Abundances and Atomic Weights]]</ref>
  |atomic mass 2=2
  |atomic mass comment=
  |electron configuration= &#91;[[xenon|Xe]]&#93; 4f<sup>3</sup> 6s<sup>2</sup>
  |electrons per shell=2, 8, 18, 21, 8, 2
  |phase=gó-tā̤
  |density gpcm3nrt=6.77
  |density gpcm3mp=6.50
  |melting point K=1208
  |melting point C=935
  |melting point F=1715
  |boiling point K=3403
  |boiling point C=3130
  |boiling point F=5666
  |heat fusion=6.89
  |heat vaporization=331
  |heat capacity=27.20
  |vapor pressure 1=1771
  |vapor pressure 10=1973
  |vapor pressure 100= (2227)
  |vapor pressure 1 k= (2571)
  |vapor pressure 10 k= (3054)
  |vapor pressure 100 k= (3779)
  |vapor pressure comment=
  |crystal structure=double hexagonal close packed
  |oxidation states=5, 4, '''3''', 2
  |oxidation states comment=(a mildly [[base (chemistry)|basic]] oxide)
  |electronegativity=1.13
  |number of ionization energies=3
  |ionization energy 1=527
  |ionization energy 2=1020
  |ionization energy 3=2086
  |atomic radius=182
  |covalent radius=203±7
  |magnetic ordering=[[paramagnetic]]
  |magnetic ordering ref=<ref name=jackson>{{cite journal|author=Jackson, M. |year=2000|title=Magnetism of Rare Earth|url=http://www.irm.umn.edu/quarterly/irmq10-3.pdf |journal=The IRM quarterly |volume=10|issue=3|page=1}}</ref>
  |electrical resistivity unit prefix=µ
  |electrical resistivity=α,&nbsp;poly: 0.700
  |electrical resistivity comment=(at&nbsp;{{abbr|r.t.|room temperature}})
  |thermal conductivity=12.5
  |thermal expansion=α, poly: 6.7
  |thermal expansion comment=(at&nbsp;{{abbr|r.t.|room temperature}})
  |speed of sound rod at 20=2280
  |Young's modulus=α&nbsp;form: 37.3
  |Shear modulus=α&nbsp;form: 14.8
  |Bulk modulus=α&nbsp;form: 28.8
  |Poisson ratio=α&nbsp;form: 0.281
  |Vickers hardness=250–745
  |Brinell hardness=250–640
  |CAS number=7440-10-0
  |isotopes=
  {{infobox element/isotopes decay | mn=141 | sym=Pr | na=100% | hl=– | dm=([[spontaneous fission|SF]]) | de=<48.450 | pn= | ps= }}
  {{infobox element/isotopes decay2 | mn=142 | sym=Pr
   | na=[[synthetic radioisotope|syn]] | hl=19.12&nbsp;h
   | dm1=[[beta minus decay|β<sup>−</sup>]] | de1=2.162 | link1=neodymium-142 | pn1=142 | ps1=Nd
   | dm2=[[electron capture|ε]] | de2=0.745 | link2=cerium-142 | pn2=142 | ps2=Ce}}
  {{infobox element/isotopes decay | mn=143 | sym=Pr
   | na=syn | hl=13.57&nbsp;d
   | dm=[[beta emission|β<sup>−</sup>]] | de=0.934 | link1=neodymium-143 | pn=143 | ps=Nd}}
  |isotopes comment=Decay modes in parentheses have been predicted, but have not yet been observed
  |discovered by=[[Carl Auer von Welsbach]]
  |discovery date=1885
  }}
  '''Praseodymium''' sê siŏh cṳ̄ng [[gĭng-sṳ̆k]], iâ sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 59, huá-hŏk hù-hô̤ sê Pr.
  ==Huá-hŏk séng-cék==
  
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  [[分類:Huá-hŏk nguòng-só]]