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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.

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Thorium is not exactly a rare element; in the Earth’s crust, it is almost as abundant as lead. At about 12 ppm in the earth’s crust, which position do you think thorium occupies in the table of most abundant elements?

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