Thorium - 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. Thorium is element number 90 on the periodic table.
Thorium oxide was used in mantles in 19th century gas lights. Also other compounds of this radioactive element were even used in toothpaste sold in Germany during World War II!
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- Video created by Periodic Videos
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