Actinium series begins with an isotope of:

actinium

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radium

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uranium

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polonium

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Solution

The correct option is B uranium
Actinium series begin with uranium $(U^{235})$
Uranium series begin with uranium $(U^{238})$
Thorium series begin with Thorium $({T h}^{232})$
Neptunium series begin with $({P u}^{241})$

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4 n + 1

(U^{235})

α

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