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Chlorine - 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 chlorine - element number 17, an extremely reactive and dangerous gas, which was used as a weapon in World War I.

During the World War 1, chlorine was used as a chemical weapon. Its poisonous gas could spread across the battlefields. The professor explained that when chlorine spread to the trenches, it would fall into them and fill them up. What chemical property of chlorine is responsible for this process?

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