Template:Infobox argon

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Argon,  18Ar
Template:Infobox element/symbol-to-top-image-alt
General properties
PronunciationTemplate:Infobox element/pronunciation
Appearancecolorless gas exhibiting a lilac/violet glow when placed in an electric field
Standard atomic weight (Ar, standard)Template:Infobox element/standard atomic weight
Mass numberTemplate:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Argon in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)18
GroupTemplate:Infobox element/group
Periodperiod 3
Blockp-block
Element categoryTemplate:Infobox element/category format
Electron configuration[Ne] 3s2 3p6
Electrons per shell
2, 8, 8
Physical properties
Phase at STPgas
Melting point83.81 K ​(−189.34 °C, ​−308.81 °F)
Boiling point87.302 K ​(−185.848 °C, ​−302.526 °F)
Density (at STP)1.784 g/L
when liquid (at b.p.)1.3954 g/cm3
Triple point83.8058 K, ​68.89 kPa[1]
Critical point150.687 K, 4.863 MPa[1]
Heat of fusion1.18 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]6.53 kJ/mol
Molar heat capacity20.85[2] J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]]
Atomic properties
Oxidation statesTemplate:Infobox element/symbol-to-oxidation-state
ElectronegativityPauling scale: no data
[[Ionization energy|Template:Engvar energies]]
  • 1st: 1520.6 kJ/mol
  • 2nd: 2665.8 kJ/mol
  • 3rd: 3931 kJ/mol
  • (more)
Covalent radius106±10 pm
Van der Waals radius188 pm
Template:Infobox element/spectral lines
Other properties
Crystal structureTemplate:Infobox element/crystal structure
Speed of sound323 m/s (gas, at 27 °C)
Thermal conductivity17.72Template:E  W/(m·K)
Magnetic orderingdiamagnetic[3]
Magnetic susceptibility−19.6·10−6 cm3/mol[4]
CAS Number7440-37-1
History
Discovery and first isolationLord Rayleigh and William Ramsay (1894)
Main isotopes of argon
Template:Infobox element/isotopes table
| references

Template:Infobox element/element navigation Template:Template reference list Two of these are named references. They may be cited in the containing article as

  • <ref name="CIAAW2016" /> for the source Atomic weights of the elements 2013 (from subtemplates used by {{Infobox element}})
  • <ref name="b92" /> for the source edited by Haynes

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  1. 1.0 1.1 Template:RubberBible92nd
  2. 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.
  3. Magnetic susceptibility of the elements and inorganic compounds, in Template:RubberBible86th
  4. Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.