Editing Noble gas (section)

== Extraction ==
Neon, argon, krypton, and xenon are obtained from air using the methods of [[liquefaction of gases]], to convert elements to a liquid state, and [[fractional distillation]], to separate mixtures into component parts. Helium is typically produced by separating it from [[natural gas]], and radon is isolated from the radioactive decay of radium compounds.<ref name="brit" /> The prices of the noble gases are influenced by their natural abundance, with argon being the cheapest and xenon the most expensive. As an example, the adjacent table lists the 2004 prices in the United States for laboratory quantities of each gas.