oganessium

== English == === Noun === oganessium (uncountable) A rejected name for oganesson ==== Usage notes ==== According to IUPAC guidelines in place in 2006, when said element was discovered, all new elements should have names ending in -ium. However, by the time oganesson was named (2016), IUPAC had changed its mind, hence the name oganesson, rather than oganessium. ==== See also ==== tennessium