Of course they are more stable, therefore they formed naturally.
All nuclear fuels contain radioactive elements.
Plutionium, Uranium and/or Americum can all be used to fuel a nuclear fission power station
Each radioactive isotope has its own rate of decay, called the "half-life". This is the time that it takes for one-half of the radioactive elements to decay into something else. For very radioactive elements, the half-life is pretty short, but sometimes the element that id decays into is itself radioactive. It _NEVER_ completely decays, but at some point the nuclear waste is no more radioactive than the background material. Remember that some elements like uranium are naturally found in rock formations, and that elements like radon are naturally occuring in the environment. This becomes a problem in the basements moutainous areas, where radon gas accumulates and can cause lung cancers. In general, nuclear waste needs to be protected and isolated for about 50 years; after that, the residual radioactivity isn't going to be especially hazardous.
Nuclear Energy
A+ Nuclear energy
Synthetic elements are usually radioactive, but not necessarily so. It is conceivable for a non-radioactive neutral atom to be produced by a nuclear spallation reaction.
All nuclear fuels contain radioactive elements.
Radioactive waves
There are at least 50 different elements produced in a nuclear explosion, most are fission products in 2 peaks, some are formed by neutron capture and beta decay. The majority of these are radioactive isotopes of the elements.
By nuclear power plants
nuclear energy
Uranium-253
Nuclear Power
One of the radioactive elements used for nuclear energy is 235U92, commonly stated as U-235.
A native from Italy, Enrica Ferni - for demonstrating the existence of radioactive elements produced for neutron irradiation. Enrico Fermi Italy "for his demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons"
They can be, depending on the reactor design.
Unstable chemical elements are disintegrated by radioactive decay.