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Thulium - 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. Thulium, element number 69, is a hard one to isolate and thus, very expensive. However, there is promise for an increased use of this element.

How many recrystallizations did it take for Charles James to obtain a pure thulium compound for the first time in 1911?

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