Oganesson
The element is named in honor of Yuri Oganessian. It was first created in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia by a joint team of Russian and American scientists. In December 2015, it was recognized as one of four new elements by the Joint Working Party of the international scientific people at IUPAC and IUPAP. It was formally named on 28 November 2016. It had a previous name given by the IUPAC called "Ununoctium" meaning "one-one-eight" in Latin. This was a placeholder name until the element was discovered and a name was given. 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 group of chemically unreactive gases similar to argon that would link the halogen and alkali metal groups. He expected that the seventh of this series would end a 32-element period which contained elements like 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.