A radioisotope forms a stable isotope after it undergoes radioactive decay. Which is the best conclusion to draw from this statement? A. It undergoes alpha decay. B. It undergoes beta decay. C. It does not participate in a decay series. D. It does not have a long half-life.

C. It does not participate in a decay series.

Explanation:

From this statement, we can deduce that a radioisotope that forms a stable isotope after it undergoes radioactive decay suggests that it does not participate in a decay series.

It could have emitted any form of radioactive particles which can be alpha or beta. We do not know if it has a long or short half life because the value is not given. But since the radioactive decay in one step produces a stable isotope, we can conclude that it did not participate in a decay series. A decay series involves a radioactive decay in multiple steps.