He Ain’t Heavy
… he’s my unbibium.
Reports of a naturally occurring superheavy element
Non peer-reviewed reports, mind you, this is on arXiv
In the neighborhood of Z = 122, A = 292, abundance = 10^-12, relative to thorium, and a half-life in excess of 100 million years. Found when doing mass-spectrometry on Thorium. The half-life appears [...]