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Question

Actinium series begins with an isotope of:

A
actinium
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B
radium
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C
uranium
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D
polonium
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Solution

The correct option is B uranium
Actinium series begin with uranium (U235)
Uranium series begin with uranium (U238)
Thorium series begin with Thorium (Th232)
Neptunium series begin with (Pu241)

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