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Oxygen - 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 oxygen - it's number 8 and is among the most "famous" of the elements.

Hemoglobin can bind to oxygen molecules, thanks to the iron atom in the centre of this metalloprotein. However, another molecule (which forms a gas) can bind to hemoglobin and block oxygen from binding. What is this poisonous gas? In which situations can we stay dangerously surrounded by it?

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