Oganesson, with the chemical symbol Og and atomic number 118, is an artificially produced chemical element that was first synthesized in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. The discovery is credited to the research of Yuri Oganessian, Vladimir Utyonkov, and their teams. Oganesson was created through the fusion of calcium-48 nuclei with plutonium-244.

The name "Oganesson" honors nuclear physicist Yuri Oganessian, a pioneer in the synthesis of heavy elements. The naming acknowledges Oganessian's groundbreaking contributions to the exploration of the periodic table. The discovery of Oganesson marks a milestone in heavy-ion research and the synthesis of superheavy elements. Oganesson is extremely unstable on Earth and does not occur naturally. It is artificially produced in particle accelerators and has no known applications outside scientific research for the extension of the periodic table.

The key Oganesson isotopes are Oganesson-294 and Oganesson-295. Oganesson-294 has an extremely short half-life of about 0.89 milliseconds, while Oganesson-295 is approximately 181 milliseconds.

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