Oganesson is a synthetic element that was first synthesized by a team of Russian and American scientists in 2002. It is the heaviest known element and is extremely unstable, with a half-life of just a few milliseconds. Oganesson belongs to the noble gas group, which means it is chemically inert, and its properties are not well understood due to the difficulty of producing and studying it. It is believed to have only been produced in extremely small amounts, and its potential uses are still largely theoretical.