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Magnesium - 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 the first "useful" metal on the periodic table. It famously burns very brightly when exposed to flame. It's magnesium.

Why did the professor say that magnesium is the first of the light metals you can actually use? What is the problem with the three lighter ones?

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