<P> Traditionally, the names of all noble gases end in "- on", with the exception of helium, which was not known to be a noble gas when discovered . The IUPAC guidelines valid at the moment of the discovery approval however required all new elements be named with the ending "- ium", even if they turned out to be halogens (traditionally ending in "- ine") or noble gases (traditionally ending in "- on"). While the provisional name ununoctium followed this convention, a new IUPAC recommendation published in 2016 recommended using the "- on" ending for new group 18 elements, regardless of whether they turn out to have the chemical properties of a noble gas . </P> <Table> <Tr> <Td> </Td> <Td> Wikinews has related news: IUPAC proposes four new chemical element names </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Wikinews has related news: IUPAC proposes four new chemical element names </Td> </Tr> <P> In June 2016 IUPAC announced that the discoverers planned to give the element the name oganesson (symbol: Og), in honour of the Russian nuclear physicist Yuri Oganessian, a pioneer in superheavy element research for sixty years reaching back to the field's foundation: his team and his proposed techniques had led directly to the synthesis of elements 106 to 113 in cold fusion reactions with lead - 208 and bismuth - 209 targets, as well as elements 112 through 118 through hot fusion reactions with calcium - 48 projectiles . The name became official on 28 November 2016 . Oganessian later commented on the naming: </P>

When was element 118 added to the periodic table