1.

\[_{90}^{232}Th\] an isotope of thorium decays in ten stages emitting six a-particles and four b-particles in all. The end product of the decay is                                               [CPMT 2005]

A.            \[_{82}^{206}Pb\]              
B.            \[_{82}^{209}Pb\]                     
C.            \[_{82}^{208}Pb\]              
D.            \[_{83}^{209}Br\]                      
Answer» D.            \[_{83}^{209}Br\]                      


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