what is the heaviest element

The heaviest element depends on the context. If we consider the heaviest naturally occurring element, then it is uranium, with an atomic number of 92 and an atomic mass of 238. However, if we consider the heaviest element ever synthesized, then it is oganesson, with an atomic number of 118 and an atomic mass of about 300. Oganesson is a synthetic element that was first synthesized in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. It is a highly unstable element, and only a few atoms of the synthetic element have ever been created, each of which survived for less than a millisecond.