There are definitely unstable superheavy elements that have never yet been produced, or at least detected, but the interesting prediction (widely accepted, but

There are definitely unstable superheavy elements that have never yet been produced, or at least detected, but the interesting prediction (widely accepted, but far from proven) is that there are some stable ones. [0] https://en.wikipedia.org/wiki/Island_of_stability https://en.wikipedia.org/wiki/Island_of_stability