It was Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell who discovered promethium. It had been predicted many years before, but had never been found or isolated. A link can be found below for more information.
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Promethium was identified and prepared for the first time in 1945, at Oak Ridge, USA by Jacob A. Marinsky, Lawrence E. Glendenin, Charles D.Coryell, Harold G. Richter.
It was first discovered by Jacob A. Marinsky, along with a few other scientists in 1944. But he did not make his claim of Promethium until 1946. The place Promethium was first discovered is still unknown to me...
it was never discovered,its like asking who discovered sex
They were discovered by scientists
Discovered
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