「Hâi」調整以後𣍐蜀樣其地方
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無編輯摘要 |
無編輯摘要 |
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Dâ̤ 1 hòng:
{{twinLAT|氦}}
{{Infobox element
[[File:Helium discharge tube.jpg|thumb|right|200px|Hâi]]▼
|name=hâi
|laname=helium
|number=2
|symbol=He
|left=[[kĭng]]
|right=[[Lī (gĭng-sṳ̆k)|lithium]]
|above=–
|below=[[neon|Ne]]
|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 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 2.5 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=
|vapor pressure 10=
|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
}}
'''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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