Russian and American scientists at Dubna bombarded californium-249 with ions of calcium-48 and measured three decay events, oganesson-294 decaying to livermorium-290, livermorium-290 decaying to flerovium-286, and flerovium-286 decaying to copernicium-282.
Atomic number 118
Only three or four atoms have been detected. Only one isotope has been sythesized, so far, with a half life of less than a millisecond. Other isotopes, if they could be synthesized, could have longer half lives.
This end is probably not the final end. Oganesson could have more isotopes and each could be more stable than expected. The periodic table could have another row and ever more clever analyses could show some improbabilities could become realities.