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

question 93

Multiple Choice

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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