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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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The professor showed us an old chemistry book, written by Aston in 1922, without promethium in the periodic table. Which other element did he show was missing because it had yet to be discovered at that time?

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