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...
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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.
it was never discovered,its like asking who discovered sex
Discovered
They were discovered by scientists
Who discovered rectangle