Editing Oganesson (section)

=== Early speculation ===
The possibility of a seventh [[noble gas]], after [[helium]], [[neon]], [[argon]], [[krypton]], [[xenon]], and [[radon]], was considered almost as soon as the noble gas group was discovered. Danish chemist [[Hans Peter Jørgen Julius Thomsen]] predicted in April 1895, the year after the discovery of argon, that there was a whole series of chemically inert gases similar to argon that would bridge the [[halogen]] and [[alkali metal]] groups: he expected that the seventh of this series would end a 32-element period which contained [[thorium]] and [[uranium]] and have an atomic weight of 292, close to the 294 now known for the first and only confirmed [[isotope]] of oganesson.{{sfn|Kragh|2018|p=6}} Danish physicist [[Niels Bohr]] noted in 1922 that this seventh noble gas should have atomic number 118 and predicted its electronic structure as 2, 8, 18, 32, 32, 18, 8, matching modern predictions.<ref name="leach">{{cite web |url=https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=285 |title=The INTERNET Database of Periodic Tables |author=Leach, Mark R. |access-date=8 July 2016}}</ref> Following this, German chemist [[Aristid von Grosse]] wrote an article in 1965 predicting the likely properties of element 118.<ref name="60s"/> It was 107 years from Thomsen's prediction before oganesson was successfully synthesized, although its chemical properties have not been investigated to determine if it behaves as the heavier [[congener (chemistry)|congener]] of radon.{{Fricke1975}} In a 1975 article, American chemist [[Kenneth Pitzer]] suggested that element 118 should be a [[gas]] or [[Volatility (chemistry)|volatile]] [[liquid]] due to [[Relativistic quantum chemistry|relativistic effects]].<ref name="Pitzer">{{cite journal |title=Are elements 112, 114, and 118 relatively inert gases? |first=Kenneth |last=Pitzer |author-link=Kenneth Pitzer |journal=[[The Journal of Chemical Physics]] |issue=63 |volume=2 |year=1975 |pages=1032–1033|doi=10.1063/1.431398 |url=https://escholarship.org/uc/item/2qw742ss }}</ref>