Arsenic - 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. This one is about arsenic -- element number 33 and is famous for the toxicity of its compounds.
Which arsenic compound was used in the 19th century as a pigment for green wallpaper?
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TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.
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