The radioactive disintegration series is historically known as the Actinium series. Which long-lived, naturally occurring heavy isotope does this series uniquely originate from?

Question

The $4n+3$ radioactive disintegration series is historically known as the Actinium series. Which long-lived, naturally occurring heavy isotope does this series uniquely originate from?

Prashant Kotian · Accepted Answer

Correct answer: C. The Actinium series is the series. Despite its name (which comes from its first discovered member, Actinium), the actual parent originating nuclide of the entire natural series is the Uranium isotope .

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