Promethium - Periodic Table of Videos
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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Promethium is element number 61 on the periodic table and its symbol is Pm.
The wife of Charles James, the element's discoverer, suggested the name promethium, after the Greek character Prometheus. It was accepted with a change to promethium in accordance with the spelling of most other metals.