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What is promethium?

What is promethium? Here are some definitions.

Noun
  1. A metallic chemical element (symbol Pm) with an atomic number of 61.
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Elements heavier than lead, and the elements technetium and promethium, exist only as radionuclides.
Finally in 1945, scientists isolated promethium from uranium fission products purified by ion-exchange chromatography.

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