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If an atom's nucleus were scaled up to the size of a marble, the entire atom would be roughly the size of what?

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Correct answer: A professional sports stadium

Atoms are almost entirely empty space! If the nucleus were scaled up to the size of a marble sitting on the 50-yard line of a football stadium, the outer electrons would be whizzing around the very top row of the stands, with nothing but empty vacuum in between.

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Source: Wikipedia (CC BY-SA)

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