Explanation:
Stable isotopes are those that occur commonly in nature, in contrast to radioactive isotopes, which are unstable and thus transform over time into more stable elements, in a process known as radioactive decay.
So the following statements are for radioactive isotopes:
a.. They naturally decay into new elements.
b. They have half-lives.
c. They spontaneously release nuclear particles and energy.
Just the following statement is true for stable isotopes:
d. They cannot be detected with a radioactive detector.
Answer: d. They cannot be detected with a radioactive detector.
