Isotopes of rhenium

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What Wikipedia says

Naturally occurring rhenium (75Re) is 37.4% 185Re, which is stable (although it is predicted to decay), and 62.6% 187Re, which is unstable but has a very long half-life (4.16×1010 years).

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