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reactive metals are typically contained in the alkali metal catagory. these can be dangerous because the give away their vallence electron to the H2O molocule causing and increase in heat and also the seperation of the atoms. in simple terms, these alkali metals explode on contact with water. lithium is the least reactive, then sodium, then potassium, then rubidium, then cesium. throwing larga amounts of these in water too close to you can result in death by explosion

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