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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.

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Promethium has been used as a paint to create luminous dials and markings by mixing it with zinc sulfide phosphorescent material. Promethium was used to replace the more dangerous radium, but nowadays it has been replaced by a much safer element, a radioactive isotope of hydrogen. Which isotope is this?

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