There's expected to be an "island of stability" at around 114 where you can get isotopes that don't instantly decay to nothing --or so I'd read. But AFAIK that hasn't been confirmed.
It's important to note that the term ``island of stability'' means stability relative to the surrounding elements
. If it should prove to exist, then, it's a couple of elements which, most likely, have isotopes which take whole minutes to spontaneously decay. This is considerably more stable than the neighbors, which in that area will decay with a half-life of milliseconds. But it's not the sort of stability that's of much obvious use for anything besides confirming models of nuclear particle interactions.