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Actinium - 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. Actinium is element number 89, and first of the actinide series.

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Additional Resources for you to Explore
For all the basics about actinium, check out the Visual Elements Periodic Table.
For amazing photos and facts about actinium, check out The Elements by Theodore Gray.
In 1945, Glenn T. Seaborg proposed the introduction of the actinides to the periodic table. This was the most significant change to Mendeleev’s periodic table.

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About TED-Ed Best of Web

TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

Meet The Creators