Isotopes of oganesson
Nuclides with atomic number of 118 but with different mass numbers / From Wikipedia, the free encyclopedia
Oganesson (118Og) is a synthetic element created in particle accelerators, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first and only isotope to be synthesized was 294Og in 2002 and 2005; it has a half-life of 0.58 milliseconds.