This page provides supplementary data about the noble gases, which were excluded from the main article to conserve space and preserve focus. Oganesson mostly not included due to the amount of research known about it.
Radon is available only in very small quantities, and due to its short half-life, is generally produced by a radium-226 source in secular equilibrium.[22] Oganesson is almost impossible to produce and with a very short half life, it is generally not readily available for purchase.
^CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Haynes, William M.,, Lide, David R., 1928-, Bruno, Thomas J. (2016-2017, 97th ed.). Boca Raton, Florida. 2016-06-22. ISBN978-1-4987-5429-3. OCLC957751024.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)
^ abGeneralic, Eni,"Radon," EniG. Periodic Table of the Elements. 27 May 2013. KTF-Split. (accessed 30 May 2013).
^Peter Häussinger; Reinhard Glatthaar; Wilhelm Rhode; Helmut Kick; Christian Benkmann; Josef Weber; Hans-Jörg Wunschel; Viktor Stenke; Edith Leicht; Hermann Stenger (2002). "Noble gases". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a17_485. ISBN978-3527306732.
^ abcLide, D. R. (Ed.) (1990). CRC Handbook of Chemistry and Physics (70th Edn.). Boca Raton (FL):CRC Press.
^ abLambda point for pure 4He from Yunus A. Cengel, Robert H. Turner. Fundamentals of thermal-fluid sciences. McGraw-Hill, 2004, p. 78. ISBN0-07-297675-6