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In metal conductors, an electric current is a flow of negatively-charged electrons, not atoms. The electrons flow as a result of a difference in electric charge across the ends of the conductor. Incidentally, 'flow' is not a very good description, because electrons move through the conductor extremely slowly -in fact, an electron in a flashlight's lamp filament is unlikely to make it through that filament in the lifetime of the battery!

On the other hand, negatively-charged atoms (negative ions) do move through conducting liquids or electrolytes. This is because, in liquids, ions are free to move and, under the influence of an external electric field, negative ions do move through electrolytes.

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