Praseodymium - 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 praseodymium, an element used to filter harmful light. Praseodymium has even helped slow light's speed down to a mere 300 meters per second!
The name, "praseodymium", is derived from the Greek “prasios didymos”, meaning green twin; it is one of two elements that makes up the mixture didymium. Its oxide is a striking green color.
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