text: # Caesium
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Caesium sê siŏh cṳ̄ng gĭng-sṳ̆k, iâ sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 55, huá-hŏk hù-hô̤ sê Cs.
title: Caesium
wikitext: {{twinLAT|銫}}
  {{infobox element
  |number=55
  |symbol=Cs
  |name=Caesi
  |enname=caesium
  |laname=caesium
  |alt name=cesium
  |left=[[xenon]]
  |right=[[barium|bari]]
  |above=[[rubidium|Rubidi]]
  |below=[[francium|Franci]]
  |series=giĕng-gĭng-sṳ̆k
  |series comment=
  |group=1
  |period=6
  |block=s
  |series color=
  |appearance=silvery gold
  |image name=Cesium.jpg
  |image size=
  |image alt=Some silvery-gold metal, with a liquid-like texture and lustre, sealed in a glass ampoule
  |image name comment=
  |image name 2=Caesium spectrum visible.png
  |image name alt 2=A colour spectrum
  |image name 2 comment=Spectral lines of caesium
  |atomic mass=132.90545196
  |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=6
  |atomic mass comment=
  |electron configuration=&#91;[[xenon|Xe]]&#93; 6s<sup>1</sup>
  |electrons per shell=2, 8, 18, 18, 8, 1
  |color=
  |phase=gó-tā̤
  |phase comment=
  |density gplstp=
  |density gpcm3nrt=1.93
  |density gpcm3nrt 2=
  |density gpcm3nrt 3=
  |density gpcm3mp=1.843
  |melting point K=301.7
  |melting point C=28.5
  |melting point F=83.3
  |sublimation point K=
  |sublimation point C=
  |sublimation point F=
  |boiling point K=944
  |boiling point C=671
  |boiling point F=1240
  |triple point K=
  |triple point kPa=
  |critical point K=1938
  |critical point MPa=9.4
  |critical point ref=<ref name=b92>{{RubberBible92nd|page=4.121}}</ref>
  |heat fusion=2.09
  |heat fusion 2=
  |heat vaporization=63.9
  |heat capacity=32.210
  |vapor pressure 1=418
  |vapor pressure 10=469
  |vapor pressure 100=534
  |vapor pressure 1 k=623
  |vapor pressure 10 k=750
  |vapor pressure 100 k=940
  |vapor pressure comment=
  |crystal structure=body-centered cubic
  |oxidation states='''+1''', −1<ref name=caeside>{{cite journal|journal = [[Angewandte Chemie|Angewandte Chemie International Edition]]|year = 1979|first = J. L.|last = Dye|title = Compounds of Alkali Metal Anions|volume = 18|issue = 8|pages = 587–598|doi = 10.1002/anie.197905871}}</ref>
  |oxidation states comment=(a strongly [[base (chemistry)|basic]] oxide)
  |electronegativity=0.79
  |number of ionization energies=3
  |ionization energy 1=375.7
  |ionization energy 2=2234.3
  |ionization energy 3=3400
  |atomic radius=265
  |atomic radius calculated=
  |covalent radius=244±11
  |Van der Waals radius=343
  |magnetic ordering=[[paramagnetic]]
  |magnetic ordering ref=<ref name=magnet>{{cite book|url=http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf|format=PDF|chapter=Magnetic susceptibility of the elements and inorganic compounds|title=Handbook of Chemistry and Physics|edition=87th|publisher=CRC press|accessdate=2010-09-26|isbn=0-8493-0487-3}}</ref>
  |electrical resistivity=
  |electrical resistivity unit prefix=n
  |electrical resistivity at 0=
  |electrical resistivity at 20=205
  |thermal conductivity=35.9
  |thermal conductivity 2=
  |thermal diffusivity=
  |thermal expansion=
  |thermal expansion at 25=97
  |speed of sound=
  |speed of sound rod at 20=
  |speed of sound rod at r.t.=
  |tensile strength=
  |Young's modulus=1.7
  |Shear modulus=
  |Bulk modulus=1.6
  |Poisson ratio=
  |Mohs hardness=0.2
  |Vickers hardness=
  |Brinell hardness=0.14
  |CAS number=7440-46-2
  |isotopes={{infobox element/isotopes decay | mn=133 | sym=Cs | na=100% | hl=– | dm=([[spontaneous fission|SF]]) | de=<34.753 | pn= | ps= }}
  {{infobox element/isotopes decay2 | mn=134 | sym=Cs
   | na=[[synthetic radioisotope|syn]] | hl=2.0648&nbsp;y
   | dm1=[[electron capture|ε]] | de1=1.229 | link1=xenon-134 | pn1=134 | ps1=Xe
   | dm2=[[beta emission|β<sup>−</sup>]] | de2=2.059 | link2=barium-124 | pn2=134 | ps2=Ba}}
  {{infobox element/isotopes decay | mn=135 | sym=Cs
   | na=[[trace radioisotope|trace]] | hl=2.3×10<sup>6</sup>&nbsp;y
   | dm=β<sup>−</sup> | de=0.269 | link1=barium-135 | pn=135 | ps=Ba}}
  {{infobox element/isotopes decay |link=Caesium-137 | mn=137 | sym=Cs
   | na=trace | hl=30.17&nbsp;y<ref name=isotope>{{cite web|title=NIST Radionuclide Half-Life Measurements|url=http://www.nist.gov/pml/data/halflife.cfm| work=[[NIST]]|accessdate=2011-03-13}}</ref>
   | dm=β<sup>−</sup> | de=1.174 |link1=barium-137 | pn=137 | ps=Ba}}
  |isotopes comment=Decay modes in parentheses are predicted, but have not yet been observed
  |naming=from Latin {{lang|la|''caesius''}}, sky blue, for its spectral colours
  |discovered by=[[Robert Bunsen]] and [[Gustav Kirchhoff]]
  |discovery date=1860
  |first isolation by=[[Carl Setterberg]]
  |first isolation date=1882
  }}
  '''Caesium''' sê siŏh cṳ̄ng [[gĭng-sṳ̆k]], iâ sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 55, huá-hŏk hù-hô̤ sê Cs.
  ==Huá-hŏk séng-cék==
  
  ==Éng-ê̤ṳng==
  
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  [[分類:Huá-hŏk nguòng-só]]