Helium.com | Chemistry | The chemical properties of helium-5 (He5) and its potential usefulness http://www.helium.com./knowledge/138821-the-chemical-properties-of-helium-5-he5-and-its-potential-usefulness.xml Helium.com > Chemistry > The chemical properties of helium-5 (He5) and its potential usefulness en-us Copyright Helium.com Mon, 05 May 2008 19:39:55 GMT Mon, 05 May 2008 19:39:55 GMT Helium is a monatomic inert gas that is the second least reactive element in Nature. (Neon is still less reactive.) It is also one of the least co... http://www.helium.com./items/1656944-what-is-helium-5 Fri, 20 Nov 2009 05:37:39