text: # Francium
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Francium sê siŏh cṳ̄ng gĭng-sṳ̆k, iâ sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 87, huá-hŏk hù-hô̤ sê Fr.
  
title: Francium
wikitext: {{twinLAT|鈁}}
  {{infobox element
  |number=87
  |symbol=Fr
  |name=franci
  |enname=francium
  |laname=francium
  |left=[[radon]]
  |right=[[Lòi (gĭng-sṳ̆k)|radi]]
  |above=[[caesium|Caesi]]
  |below=([[Ununennium|Uue]])
  |series=giĕng-gĭng-sṳ̆k
  |group=1
  |period=7
  |block=s
  |appearance=
  |atomic mass=(223)
  |electron configuration=&#91;[[radon|Rn]]&#93; 7s<sup>1</sup>
  |electrons per shell=2, 8, 18, 32, 18, 8, 1
  |phase=gó-tā̤
  |phase comment=presumably
  |density gpcm3nrt=1.87
  |density gpcm3nrt comment=''(extrapolated)''
  |melting point K=? 300
  |melting point C=27
  |melting point F=80
  |boiling point K=? 950
  |boiling point C=677
  |boiling point F=1250
  |heat fusion=ca. 2
  |heat vaporization=ca. 65
  |vapor pressure 1=404
  |vapor pressure 10=454
  |vapor pressure 100=519
  |vapor pressure 1 k=608
  |vapor pressure 10 k=738
  |vapor pressure 100 k=946
  |vapor pressure comment=''(extrapolated)''
  |crystal structure=body-centered cubic
  |crystal structure comment=''(extrapolated)''
  |oxidation states='''+1'''
  |oxidation states comment=(a&nbsp;strongly [[base (chemistry)|basic]] oxide)
  |electronegativity=0.7
  |number of ionization energies=1
  |ionization energy 1=393<ref>ISOLDE Collaboration, J. Phys. B 23, 3511 (1990) ([http://iopscience.iop.org/0953-4075/23/20/014/pdf/0953-4075_23_20_014.pdf PDF online])</ref>
  |covalent radius=260
  |covalent radius comment=''(extrapolated)''
  |Van der Waals radius=348
  |Van der Waals radius comment=''(extrapolated)''
  |magnetic ordering=Paramagnetic
  |electrical resistivity=3
  |electrical resistivity unit prefix=µ
  |electrical resistivity comment=''(calculated)''
  |thermal conductivity=15
  |thermal conductivity comment=''(extrapolated)''
  |CAS number=7440-73-5
  |isotopes=
  {{infobox element/isotopes decay | mn=221 | sym=Fr
   | na=[[trace radioisotope|trace]] | hl=4.8&nbsp;min
   | dm=[[alpha emission|α]] | de=6.457 | link1=astatine-217 | pn=217 | ps=At}}
  {{infobox element/isotopes decay | mn=222 | sym=Fr
   | na=[[synthetic radioisotope|syn]] | hl=14.2&nbsp;min
   | dm=[[beta emission|β<sup>−</sup>]] | de=2.033 | link1=radium-222 | pn=222 | ps=Ra}}
  {{infobox element/isotopes decay2 | mn=223 | sym=Fr
   | na=trace | hl=22.00&nbsp;min
   | dm1=β<sup>−</sup> | de1=1.149 | link1=radium-223 | pn1=223 | ps1=Ra
   | dm2=α | de2=5.430 | link2=astatine-219 | pn2=219 | ps2=At}}
  |isotopes comment=
  |naming=after [[France]], homeland of the discoverer
  |discovery and first isolation by=[[Marguerite Perey]]
  |discovery date=1939
  }}
  '''Francium''' sê siŏh cṳ̄ng [[gĭng-sṳ̆k]], iâ sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 87, huá-hŏk hù-hô̤ sê Fr.
  ==Huá-hŏk séng-cék==
  
  ==Éng-ê̤ṳng==
  
  ==Cié-chṳ̄==
  
  ==Chăng-kō̤ cṳ̆-lâiu==
  {{reflist}}
  
  {{Ciŭ-gĭ-biēu}}
  {{Authority control}}
  [[分類:Huá-hŏk nguòng-só]]