Ununoctium, now known as Oganesson (Og), is a synthetic element with the atomic number 118. It was first created in 2002 by a team of Russian and American scientists. As a member of the noble gases, it is expected to be colorless, odorless, and tasteless, although its properties are not well-studied due to its extreme instability and short half-life. This element is highly radioactive and decays rapidly, making it difficult to observe in significant quantities. Oganesson is named in honor of the physicist Yuri Oganessian, who contributed to the discovery of superheavy elements. Its existence helps scientists understand the behavior of matter under extreme conditions.