Argon is in the atmospheres of Sanghelios, Te, High Charity, and others, so it is Halo related. Specops306, Kora 'Morhek 20:27, 3 April 2008 (UTC)
Would an image of the atomic structure be helpful? There are probably plenty on google or something of that sort.Potatom 19:00, 9 March 2009 (UTC)