Question

Number of a and p emitted in the reaction ${ }_{92} U^{238} \rightarrow_{82} P b^{206}$ are

• A. $6\alpha$ and $ 8\beta $
• B. $ 8\alpha $ and $ 6\beta $
• C. $ 6\alpha $ and $ 4\beta $
• D. $ 4\beta $ and $ 6\beta $

Answer 1

Answer: (B)

If a radioactive element emitted one a-particle, its atomic number decreases by two unit and mass number decreases by four units and if a radioactive element emitted one p-particle, its atomic number increases by one unit and mass number doesn't changes.
${ }_{92} U^{238} \xrightarrow{-8 \alpha}_{76} X^{206} \xrightarrow{-6 \beta} {}_{82} Pb^{206}$