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An atom is the smallest particle of an element that can exist on its own. In other words, if you have a bar of solid gold, the smallest particle that could exist by itself and still be considered gold would be one atom of gold.
An atom is the smallest particle of an element that can exist on its own. In other words, if you have a bar of solid gold, the smallest particle that could exist by itself and still be considered gold would be one atom of gold.