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Potassium - 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 potassium -- an "evil" element, but one that's crucial to life. In this video, see some violent explosions and the gentle creation of a potassium mirror.

What is the name of the amalgam made with sodium and potassium; liquid at room temperature, and so reactive with water that it can catch fire when exposed to air?

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