There are three radioactive series: the thorium series,which begins with ²³²Th,the uranium series which starts with ²³⁸U and the actinium series which starts with what isotope? A)(²³⁵U) B)(²¹⁶Po) C)(²²¹Rn) D)(²¹⁴Pb) E)(²²⁶Ra)

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The actinium series starts with uranium-235 (U-235), which is represented as $\text{^{235}_{92}U}$.

There Are Three Radioactive Series: the Thorium Series,which Begins with 232Th,the

There Are Three Radioactive Series: the Thorium Series,which Begins with ²³²Th,the