Science
Promethium is entirely synthetic and inherently unstable
HERE’S THE INTERESTING PART
Promethium is the glaring empty gap in the middle of the lanthanides. It simply does not exist naturally on this planet because every single isotope is fiercely unstable. If you want to hold promethium, you have to artificially smash atoms together in a high-tech facility, only to watch it aggressively disintegrate right in front of you.
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