Protactinium (new) - 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. Protactinium is element number 91 on the periodic table.
Mendeleev predicted the existence of more elements than were actually found. Some of his predictions were wrong, but usually we celebrate his successes and ignore the failures because the prediction was a real intellectual triumph that laid the foundations of modern chemistry.
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