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A stable element is an element that does not provide radioactivity. 1 kg of Gold will be 1 kg of gold even after 100.000 years. It is a stable element.

An unstable element (like Uranium or Plutoneum) gives off radioactivity and actually form new elements like lead. 1 kg of pure Uranium will be 500 grams of Uranium and 500 grams of lead after 100.000 years.

Times given and breakdown products are for illustrative purposes only. Degradation of unstable materials is not my science but I know the basics of it :-)

Regards.

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Q: Differences between stable and unstable elements in the periodic table?
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