text: # Hâi
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Hâi (氦) sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 2, huá-hŏk hù-hô̤ sê He.
title: Hâi
wikitext: {{twinLAT|氦}}
  {{Infobox element
  |name=He­li
  |laname=helium
  |number=2
  |symbol=He
  |left=[[kĭng]]
  |right=[[Lī (gĭng-sṳ̆k)|Liti]]
  |above=–
  |below=[[Neon]]
  |series=hĭ-iū ké-tā̤
  |series comment=
  |group=18
  |period=1
  |block=s
  |series color=
  |appearance=colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
  |image name=Helium discharge tube.jpg
  |image name comment=
  |image name 2=Helium spectra.jpg
  |image name 2 comment=Spectral lines of helium
  |atomic mass=4.002602
  |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=1s<sup>2</sup>
  |electrons per shell=2
  |color=
  |phase=ké-tā̤
  |phase comment=
  |density gplstp=0.1786
  |density gpcm3nrt=
  |density gpcm3bp=0.125
  |density gpcm3mp=0.145
  |melting point K=0.95
  |melting point C=−272.20
  |melting point F=−457.96
  |melting point comment=(at&nbsp;2.5&nbsp;MPa)
  |boiling point K=4.222
  |boiling point C=−268.928
  |boiling point F=−452.070
  |triple point K=2.177
  |triple point kPa=5.043
  |critical point K=5.1953
  |critical point MPa=0.22746
  |heat fusion=0.0138
  |heat vaporization=0.0829
  |heat capacity=20.78<ref>Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01.</ref>
  |vapor pressure 1=&nbsp;
  |vapor pressure 10=&nbsp;
  |vapor pressure 100=1.23
  |vapor pressure 1 k=1.67
  |vapor pressure 10 k=2.48
  |vapor pressure 100 k=4.21
  |vapor pressure comment=(defined by [[International Temperature Scale of 1990|ITS-90]])
  |crystal structure=hexagonal close-packed
  |oxidation states='''0'''
  |oxidation states comment=
  |electronegativity=no data
  |number of ionization energies=2
  |ionization energy 1=2372.3
  |ionization energy 2=5250.5
  |ionization energy 3=
  |atomic radius=
  |atomic radius calculated=
  |covalent radius=28
  |Van der Waals radius=140
  |magnetic ordering=[[diamagnetic]]
  |magnetic ordering ref=<ref>[http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf Magnetic susceptibility of the elements and inorganic compounds], in Handbook of Chemistry and Physics 81st edition, CRC press.</ref>
  |electrical resistivity=
  |electrical resistivity at 0=
  |electrical resistivity at 20=
  |thermal conductivity=0.1513
  |thermal conductivity 2=
  |thermal diffusivity=
  |thermal expansion=
  |thermal expansion at 25=
  |speed of sound=972
  |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=7440-59-7
  |isotopes=
  {{Infobox element/isotopes stable | mn=3 | sym=He | na=0.000137%* | n=1 | link=Helium-3 |firstlinks=yes}}
  {{Infobox element/isotopes stable | mn=4 | sym=He | na=99.999863%* | n=2 | link=Helium-4 |firstlinks=no}}
  |isotopes comment=<nowiki>*</nowiki> Atmospheric value, abundance may differ elsewhere
  |naming=after [[Helios]], Greek god of the Sun
  |predicted by=
  |prediction date=
  |discovered by=[[Pierre Janssen]], [[Norman Lockyer]]
  |discovery date=1868
  |first isolation by=[[William Ramsay]], [[Per Teodor Cleve]], [[Abraham Langlet]]
  |first isolation date=1895
  }}
  [[文件:HeNe Laser Build.webm|縮圖|Hâi]]
  '''Hâi''' (氦) sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 2, huá-hŏk hù-hô̤ sê He.
  
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