Isotopes of thallium

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The only stable isotopes of thallium (81Tl) are 203Tl and 205Tl, which make up all natural thallium. The five short-lived isotopes 206Tl through 210Tl also occur in nature, but only as part of the natural decay chains of heavier elements.

Excerpt from the Wikipedia article “Isotopes of thallium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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