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Undid revision 1010679703 by Vitosmo (talk)

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{{Infobox element
|engvar={{{engvar|}}}
|name=argon
|number=18
|symbol=Ar
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[chlorine]]
|right=[[potassium]]
|above=[[neon|Ne]]
|below=[[krypton|Kr]]
|category comment=
|group=18
|period=3
|block=p
|appearance=colorless gas exhibiting a lilac/violet glow when placed in an electric field
|image name=Argon discharge tube.jpg
|electrons per shell=2, 8, 8
|phase=
|density gplstp=1.784
|density gpcm3nrt=
|density gpcm3nrt 2=
|density gpcm3mp=
|density gpcm3bp=1.3954
|melting point K=83.81
|melting point C=−189.34
|melting point F=−308.81
|boiling point K=87.302
|boiling point C=−185.848
|boiling point F=−302.526
|triple point K=83.8058
|triple point kPa=68.89
|triple point ref=<ref name=b92/>
|critical point K=150.687
|critical point MPa=4.863
|critical point ref=<ref name=b92>{{RubberBible92nd|page=4.121}}</ref>
|heat fusion=1.18
|heat fusion 2=
|heat vaporization=6.53
|heat capacity=20.85<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=47
|vapor pressure 100=53
|vapor pressure 1 k=61
|vapor pressure 10 k=71
|vapor pressure 100 k=87
|vapor pressure comment=
|crystal structure=face-centered cubic
|electronegativity=no data
|number of ionization energies=4
|ionization energy 1=1520.6
|ionization energy 2=2665.8
|ionization energy 3=3931
|atomic radius=
|atomic radius calculated=
|covalent radius=106±10
|Van der Waals radius=188
|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 {{RubberBible86th}}</ref>
|electrical resistivity=
|electrical resistivity at 0=
|electrical resistivity at 20=
|thermal conductivity=17.72{{e|-3}} 
|thermal conductivity 2=
|thermal diffusivity=
|thermal expansion=
|thermal expansion at 25=
|speed of sound=323
|speed of sound comment=(gas, at 27 °C)
|speed of sound rod at 20=
|speed of sound rod at r.t.=
|magnetic susceptibility=−19.6·10−6
|magnetic susceptibility ref= <ref>{{Cite book|title=CRC, Handbook of Chemistry and Physics|last=Weast|first=Robert|publisher=Chemical Rubber Company Publishing|year=1984|isbn=0-8493-0464-4|location=Boca Raton, Florida|pages=E110}}</ref>
|Young's modulus=
|Shear modulus=
|Bulk modulus=
|Poisson ratio=
|Mohs hardness=
|Vickers hardness=
|Brinell hardness=
|CAS number=7440-37-1
|isotopes=
{{infobox element/isotopes stable | mn=36 | sym=Ar
|na=0.334% | n=18 |firstlinks=yes}}
{{infobox element/isotopes decay | mn=37 | sym=Ar
|na=[[synthetic radioisotope|syn]] | hl=35 d
|dm=[[electron capture|ε]] | de=0.813 | link1=chlorine-37 | pn=37 | ps=Cl}}
{{Infobox element/isotopes stable | mn=38 | sym=Ar | na=0.063% | n=20 |firstlinks=no}}
{{infobox element/isotopes decay | mn=39 | sym=Ar
|na=[[trace radioisotope|trace]] | hl=269 y
|dm=[[beta emission|β−]] | de=0.565 |link1=potassium-39 | pn=39 | ps=K}}
{{Infobox element/isotopes stable | mn=40 | sym=Ar | na=99.604% | n=22 |firstlinks=no}}
{{infobox element/isotopes decay | mn=41 | sym=Ar
|na=syn | hl=109.34 min
|dm=β− | de=2.49 | link1=potassium-41 | pn=41 | ps=K}}
{{infobox element/isotopes decay | mn=42 | sym=Ar
|na=syn | hl=32.9 y
|dm=β− | de=0.600 | link1=potassium-42 | pn=42 | ps=K}}
|isotopes comment={{chem|36|Ar}} and {{chem|38|Ar}} content may be as high as 2.07% and 4.3% respectively in natural samples. {{chem|40|Ar}} is the remainder in such cases, whose content may be as low as 93.6%.
|discovery and first isolation by=[[Lord Rayleigh]] and [[William Ramsay]]
|discovery date=1894
|QID=Q696
}}<noinclude>
{{Infobox element/element navigation|symbol=Ar}}
{{Template reference list}}
Two of these are [[WP:REFNAME|named references]]. They may be cited in the containing article as
*<nowiki><ref name="CIAAW2013" /></nowiki> for the source ''Atomic weights of the elements 2013'' (from subtemplates used by {{tl|Infobox element}})
* <nowiki><ref name="b92" /></nowiki> for the source edited by Haynes
{{documentation|1=Template:Infobox element/doc}}
[[Category:Templates that generate named references]]
</noinclude>

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setup>Vitosmo: Undid revision 1010679703 by Vitosmo (talk)