text: # Lanthanum
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Lanthanum sê siŏh cṳ̄ng gĭng-sṳ̆k, iâ sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 57, huá-hŏk hù-hô̤ sê La.
  
title: Lanthanum
wikitext: {{twinLAT|鑭}}
  {{Infobox element
  |number=57
  |symbol=La
  |name=Lantan
  |enname=lanthanum
  |laname=lanthanum
  |left=[[barium|Bari]]
  |right=[[cerium|Ceri]]
  |above=–
  |below=[[actinium|Actini]]
  |series=lanthanum-hiê
  |series comment=ô sèng-âu dóng có̤ [[guó-dô gĭng-sṳ̆k]]
  |period=6
  |group=n/a
  |block=f
  |image name=Lanthanum-2.jpg
  |appearance=silvery white
  |atomic mass=138.90547
  |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=7
  |atomic mass comment=
  |electron configuration=&#91;[[xenon|Xe]]&#93; 5d<sup>1</sup> 6s<sup>2</sup>
  |electrons per shell=2, 8, 18, 18, 9, 2
  |phase=gó-tā̤
  |density gpcm3nrt=6.162
  |density gpcm3mp=5.94
  |melting point K=1193
  |melting point C=920
  |melting point F=1688
  |boiling point K=3737
  |boiling point C=3464
  |boiling point F=6267
  |heat fusion=6.20
  |heat vaporization=400
  |heat capacity=27.11
  |vapor pressure 1=2005
  |vapor pressure 10=2208
  |vapor pressure 100=2458
  |vapor pressure 1 k=2772
  |vapor pressure 10 k=3178
  |vapor pressure 100 k=3726
  |vapor pressure comment=(extrapolated)
  |crystal structure=double hexagonal close packed
  |oxidation states='''3''', 2, 1
  |oxidation states comment=(a strongly [[base (chemistry)|basic]] oxide)
  |electronegativity=1.10
  |number of ionization energies=3
  |ionization energy 1=538.1
  |ionization energy 2=1067
  |ionization energy 3=1850.3
  |atomic radius=187
  |covalent radius=207±8
  |magnetic ordering=[[paramagnetic]]
  |magnetic ordering ref=<ref name=magnet>{{cite book | url = 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 | accessdate = 2018-06-03 | archive-date = 2011-03-03 | archive-url = https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf | deadurl =  }}</ref>
  |electrical resistivity unit prefix=n
  |electrical resistivity=α, poly: 615
  |electrical resistivity comment=(at&nbsp;{{abbr|r.t.|room temperature}})
  |thermal conductivity=13.4
  |thermal expansion=α, poly: 12.1
  |thermal expansion comment=(at&nbsp;{{abbr|r.t.|room temperature}})
  |speed of sound rod at 20=2475
  |Young's modulus=α form: 36.6
  |Shear modulus=α form: 14.3
  |Bulk modulus=α form: 27.9
  |Poisson ratio=α form: 0.280
  |Mohs hardness=2.5
  |Vickers hardness=360–1750
  |Brinell hardness=350–400
  |CAS number=7439-91-0
  |isotopes=
  {{infobox element/isotopes decay | mn=137 | sym=La
   | na=[[synthetic radioisotope|syn]] | hl=[[1 E8 s|6×10<sup>4</sup>&nbsp;y]]
   | dm=[[electron capture|ε]] | de=0.600 | link1=barium-137 | pn=137 | ps=Ba}}
  {{infobox element/isotopes decay2 | mn=138 | sym=La
   | na=0.090% | hl=[[1 E16 s|1.05&times;10<sup>11</sup>&nbsp;y]]
   | dm1=ε | de1=1.737 | link1=barium-138 | pn1=138 | ps1=Ba
   | dm2=[[beta emission|β<sup>−</sup>]] | de2=1.044 | link2=cerium-138 | pn2=138 | ps2=Ce}}
  {{infobox element/isotopes decay | mn=139 | sym=La | na=99.910% | hl=– | dm=([[spontaneous fission|SF]]) | de=<38.944 | pn= | ps= }}
  |isotopes comment=Decay modes in parentheses are predicted, but have not yet been observed
  |discovered by=[[Carl Gustaf Mosander]]
  |discovery date=1838
  }}
  '''Lanthanum''' sê siŏh cṳ̄ng [[gĭng-sṳ̆k]], iâ sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 57, huá-hŏk hù-hô̤ sê La.
  ==Huá-hŏk séng-cék==
  
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  [[分類:Huá-hŏk nguòng-só]]