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Sodium - 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 a reactive alkali metal and element number 11 on the periodic table - sodium.

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To prevent air or moisture from getting to to the sample and causing a violent reaction between sodium and water, Neil stored the sodium sample under oil. Which of these gases could be safely used to replace the oil and store sodium?

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