Question

Which of the following is always true about radioisotopes?

A. They have unstable nuclei.

B. Their neutron-to-proton ratio is 1:1.

C. Their decay products are stable isotopes.

Answer 1

A. C might be tempting, because it isn't always remembered that most radioactive decays are part of a long chain of decays -- A to B to C to D to E ..... to S, where only the final result is stable.