Bismuth-209

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Notion

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Science and technology

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What Wikipedia says

Bismuth-209 (209Bi) is an isotope of bismuth with the longest known half-life of any nuclide that undergoes α-decay (alpha decay); the decay product is thallium-205. It has 83 protons and a magic number of 126 neutrons, and naturally occurring bismuth consists entirely of this isotope.

Excerpt from the Wikipedia article “Bismuth-209”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: SM358, Public domain, via Wikimedia Commons.