I've read about this somewhere, Apparently any elements above 118 protons are too unstable to even exist, Oganesson's most stable Isotope (Oganesson-294) only has a half life of around 0.89 milliseconds.The problem with elements with a proton amount higher than 118, is that due to the increasing repulsive forces between protons in the nucleus, the nuclear force holding due the nucleus together is overwhelmed and starts decaying rapidly. This causes elements above a 118 proton count to be extremely unstable; however, scientists studying this topic guess that above 118 protons there is an "island of stability" (around 114 protons and 184 neutrons) wherein super-heavy elements have longer half times than exhibited by their neighbors. While as of current times no element beyond 118 protons have been synthesized, the fact that elements with 118 protons even exist and also that their lifetimes increase when approaching the hypothetical island, is promising evidence. Attached here is a diagram.