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The densities of lithium, sodium and potassium are less than that of water and so they float on water. They react with water to produce hydrogen gas and this propels the metal across the surface of the water.

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Q: What causes an alkali metal to move over the surface of water while reacting with it?
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Related questions

Is an alkali metal a base?

The metal itself, no. But after reacting with water or something containing water it produces a very strong base.


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