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...ry]] performed studies finding [[xenon]] gas to be a suitable replacement. Xenon is now the preferred propellant for ion engines as it has a high molecular ...irst1=YX|last2=Sun|first2=RK|last3=Sun|first3=Y|last4=Chen|first4=ZQ|last5=Li|first5=LH|issue=2}}</ref> A study has shown that acute exposure (4 – 8 ho

{{Infobox xenon}} ...> Its [[atomic number]] is 54. A colorless, heavy, odorless [[noble gas]], xenon occurs in the [[Earth's atmosphere]] in trace amounts.<ref>{{cite web