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Which element has the heaviest atoms that occur naturally on Earth in significant quantities?

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Correct answer: Uranium

Uranium, with 92 protons, is the heaviest naturally occurring element found in significant amounts. While trace amounts of heavier elements like neptunium and plutonium exist in uranium ores, they are incredibly rare. Photo: Unspecified, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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