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That's called a daughter isotope, or a daughter product. (The original isotope that decayed is the parent isotope.)
it must eject the extra nucleons and should be conveted into a stable isotope.
Radioactive elements break down in to stable isotopes through nuclear decay. The list of isotopes from a nuclear isotope to a stable isotope is called its decay chain.
Succesive radioactive disintegrations in a radioactive series.
The radioactive isotope is disintegrated in time and emit radiations.
The radioactive isotope is disintegrated in time and emit radiations.
Stable isotopes are chemical isotopes that are not radioactive, meaning that they do not spontaneously undergo radioactive decay.
daughter isotope
radioactive decay
If you had a stable element 115, then by definition there would need to be at least one non-radioactive isotope. Stable elements are those that have at least one nonradioactive isotope. Of course, the other isotopes of the element could all be radioactive.
1. All the radioactive isotopes are unstable ! 2. Yes, it is true, the parent isotope (radioactive and unstable) decay and form daughter products.
No, it has only one stable isotope.