text: # Actinium
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Actinium sê siŏh cṳ̄ng gĭng-sṳ̆k, iâ sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 89, huá-hŏk hù-hô̤ sê Ac.
title: Actinium
wikitext: {{twinLAT|錒}}
  {{Infobox element
  |name=Actini
  |enname=actinium
  |laname=actinium
  |number=89
  |symbol=Ac
  |left=[[Lòi (gĭng-sṳ̆k)|radi]]
  |right=[[thorium|Thori]]
  |above=[[lanthanum|Lantan]]
  |below=(Uqu)
  |series=actinium-hiê
  |series comment=ô sèng-âu dóng có̤ [[guó-dô gĭng-sṳ̆k]]
  |group=n/a
  |period=7
  |block=f
  |series color=
  |appearance=silvery-white, glowing with an eerie blue light;<ref>{{cite web |url=http://pubs.acs.org/cen/80th/actinium.html |title=C&EN: It's Elemental: The Periodic Table - Actinium |author=Wall, Greg |date=8 September 2003 |work=C&EN: It's Elemental: The Periodic Table |publisher=Chemical and Engineering News |accessdate=2 June 2011}}</ref> sometimes with a golden cast<ref name="Kirby">{{cite book |last1=Kirby |first1=Harold W. |last2=Morss |first2=Lester R. |title=The Chemistry of the Actinide and Transactinide Elements |pages=18 |year=2006 |doi=10.1007/1-4020-3598-5_2 |chapter=Actinium |isbn=978-1-4020-3555-5}}</ref>
  |image name=
  |image name comment=
  |image name 2=
  |image name 2 comment=
  |atomic mass=(227)
  |atomic mass 2=
  |atomic mass comment=
  |electron configuration=&#91;[[radon|Rn]]&#93; 6d<sup>1</sup> 7s<sup>2</sup>
  |electrons per shell=2, 8, 18, 32, 18, 9, 2
  |color=
  |phase=gó-tā̤
  |phase comment=
  |density gplstp=
  |density gpcm3nrt=10
  |melting point K=1500
  |melting point C=1227
  |melting point F=2240
  |melting point comment=''(estimated)''<ref name=Kirby/>
  |boiling point K=3500±300
  |boiling point C=3200±300
  |boiling point F=5800±500
  |boiling point comment=''(extrapolated)''<ref name=Kirby/>
  |triple point K=
  |triple point kPa=
  |critical point K=
  |critical point MPa=
  |heat fusion=14
  |heat vaporization=400
  |heat capacity=27.2
  |crystal structure=face-centered cubic
  |oxidation states='''3''', 2
  |oxidation states comment=(a neutral oxide)
  |electronegativity=1.1
  |number of ionization energies=2
  |ionization energy 1=499
  |ionization energy 2=1170
  |atomic radius=
  |covalent radius=215
  |Van der Waals radius=
  |electrical resistivity=
  |electrical resistivity at 0=
  |electrical resistivity at 20=
  |thermal conductivity=12
  |thermal conductivity 2=
  |thermal diffusivity=
  |thermal expansion=
  |thermal expansion at 25=
  |speed of sound=
  |speed of sound rod at 20=
  |speed of sound rod at r.t.=
  |Young's modulus=
  |Shear modulus=
  |Bulk modulus=
  |Poisson ratio=
  |Mohs hardness=
  |Vickers hardness=
  |Brinell hardness=
  |CAS number=7440-34-8
  |isotopes=
  {{infobox element/isotopes decay | mn=225 | sym=Ac
   | na=[[trace radioisotope|trace]] | hl=[[1 E s|10&nbsp;d]]
   | dm=[[alpha decay|α]] | de=5.935 | link1=francium-221 | pn=221 | ps=Fr}}
  {{infobox element/isotopes decay3| mn=226 | sym=Ac
   | na=[[synthetic radioisotope|syn]] | hl=[[1 E s|29.37&nbsp;h]]
   | dm1=[[beta emission|β<sup>−</sup>]] | de1=1.117 | link1=thorium-226 | pn1=226 | ps1=Th
   | dm2=[[electron capture|ε]] | de2=0.640 | link2=radium-226 | pn2=226 | ps2=Ra
   | dm3=α | de3=5.536 | link3=francium-222 | pn3=222 | ps3=Fr}}
  {{infobox element/isotopes decay2 | mn=227 | sym=Ac
   | na=trace | hl=[[1 E s|21.772&nbsp;y]]
   | dm1=β<sup>−</sup> | de1=0.045 | link1=thorium-227 | pn1=227 | ps1=Th
   | dm2=α | de2=5.042 | link2=francium-223 | pn2=223 | ps2=Fr}}
  |isotopes comment=
  |discovery and first isolation by=[[Friedrich Oskar Giesel]]
  |discovery date=1902
  }}
  '''Actinium''' sê siŏh cṳ̄ng [[gĭng-sṳ̆k]], iâ sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 89, huá-hŏk hù-hô̤ sê Ac.
  ==Huá-hŏk séng-cék==
  
  ==Éng-ê̤ṳng==
  
  ==Cié-chṳ̄==
  
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  [[分類:Huá-hŏk nguòng-só]]