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Actinium 231,.^(231)AC(89), emit in succ...

Actinium 231,`.^(231)AC_(89)`, emit in succession two `beta` particles, four `alpha`-particles, one `beta` and one `alpha` plus several `lambda` rays. What is the resltant isotope?

A

`.^(221)Au_(79)`

B

`.^(211)Au_(79)`

C

`.^(221)Pb_(82)`

D

`.^(211)Pb_(82)`

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