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Question

(A) An $\alpha$-particle is a helium nucleus,represented as $_{2}He^{4}$.When a radioactive isotope $_{A}X^{M}$ emits an $\alpha$-particle,the atomic

Vedclass · Accepted Answer

$A - 2, M - 4$

Vedclass · Answer

(A) An $\alpha$-particle is a helium nucleus,represented as $_{2}He^{4}$.When a radioactive isotope $_{A}X^{M}$ emits an $\alpha$-particle,the atomic number decreases by $2$ and the mass number decreases by $4$.The nuclear reaction is: $_{A}X^{M} \rightarrow _{A-2}Y^{M-4} + _{2}He^{4}$.Therefore,the new atomic number is $A - 2$ and the new mass number is $M - 4$.

If a radioactive isotope with atomic number $A$ and mass number $M$ emits an $\alpha$-particle,the atomic number and mass number of that new isotope will become:

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