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Nitrogen - 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 number 7 on the periodic table: nitrogen. It's the most abundant element in Earth's atmosphere.

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In the School of Chemistry at the University of Nottingham, there is a lift (elevator) with a sign that states, “Danger! Risk of Asphyxiation. Do not ride in the lift with dewars containing cryogenic liquids”. Why?

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