Editing Argon (section)

==Characteristics==
[[File:Argon ice 1.jpg|upright|thumb|left|A small piece of rapidly melting solid argon]]

Argon has approximately the same [[solubility]] in water as [[oxygen]] and is 2.5 times more soluble in water than [[nitrogen]]. Argon is colorless, odorless, nonflammable and nontoxic as a solid, liquid or gas.<ref>{{cite web |url= http://www.uigi.com/MSDS_gaseous_Ar.html |title=Material Safety Data Sheet Gaseous Argon |website= UIGI.com| publisher= Universal Industrial Gases, Inc. |access-date=14 October 2013 }}</ref> Argon is chemically [[Inert gas|inert]] under most conditions and forms no confirmed stable compounds at room temperature.

Although argon is a [[noble gas]], it can form some compounds under various extreme conditions. [[Argon fluorohydride]] (HArF), a compound of argon with [[fluorine]] and [[hydrogen]] that is stable below {{cvt|17|K}}, has been demonstrated.<ref>{{cite journal
 |display-authors=4
 |first1= Leonid | last1= Khriachtchev
 |first2=Mika | last2= Pettersson
 |first3=Nino | last3=Runeberg
 |first4=Jan | last4= Lundell
 |first5= Markku | last5= Räsänen
 |s2cid=4382128
 |name-list-style=amp
 |date=2000
 |title=A stable argon compound
 |journal=[[Nature (journal)|Nature]]
 |volume=406 |issue=6798
 |pages=874–876
 |doi = 10.1038/35022551
 |pmid=10972285|bibcode=2000Natur.406..874K
 }}</ref><ref name="sciencenews-harf">
{{cite news
 |last=Perkins |first=S.
 |date=26 August 2000
 |title=HArF! Argon's not so noble after all – researchers make argon fluorohydride
 |url=http://www.sciencenews.org/view/generic/id/795/description/HArF_Argons_not_so_noble_after_all |work= Science News}}</ref> Although the neutral ground-state chemical compounds of argon are presently limited to HArF, argon can form [[clathrates]] with water when atoms of argon are trapped in a lattice of water molecules.<ref>
{{cite journal
 |display-authors=4
 |author=Belosludov, V. R.
 |author2=Subbotin, O. S.
 |author3=Krupskii, D. S.
 |author4=Prokuda, O. V.
 |author5=Belosludov, R. V.
 |author6=Kawazoe, Y.
 |date=2006
 |title=Microscopic model of clathrate compounds
 |journal=[[Journal of Physics: Conference Series]]
 |volume=29 |issue=1
 |pages=1–7
 |doi = 10.1088/1742-6596/29/1/001
|bibcode = 2006JPhCS..29....1B |doi-access=free }}</ref> [[Ions]], such as {{chem|ArH|+}}, and [[exciplex|excited-state complexes]], such as ArF, have been demonstrated. Theoretical calculation predicts several more [[argon compounds]] that should be stable<ref>
{{cite journal
 |last1=Cohen |first1=A.
 |last2=Lundell |first2=J.
 |last3=Gerber |first3=R. B.
 |s2cid=95850840
 |date=2003
 |title=First compounds with argon–carbon and argon–silicon chemical bonds
|journal=[[Journal of Chemical Physics]]
|volume=119 |pages = 6415
|doi=10.1063/1.1613631
|bibcode = 2003JChPh.119.6415C
|issue=13 }}</ref> but have not yet been synthesized.