In this flammable episode of Joe Genius, backyard scientists quickly learn that sodium, magnesium, and many other metals are among the most active elements on the periodic table.
In this video he shoes that the elements (metals) with one electron can easily start on fire with just a bit of water. Potassium and Lithium, they react because they really want to get rid of that one electron. Magnesium also reacts to water but not as fast or as well because it has 2 electrons on the outter layer. Not just one. Magnesium also reacts when you try to put out the fire with a rock. It will make a giant explosion.
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