23892U
Uranium238
No
Decay series
yes
No. Some are stable.
Heavy nuclides are atoms that have a high atomic number and are typically found in the lower region of the periodic table, such as elements like lead, uranium, and thorium. These nuclides often have a high mass and can be unstable, leading to radioactive decay.
Isotones, isotonic nuclides
Carbon-14
Unstable nuclides undergo nuclear reactions in order to become more stable. These reactions involve the nucleus gaining or losing subatomic particles in an attempt to achieve a more favorable balance of protons and neutrons. By undergoing nuclear reactions, unstable nuclides can transform into more stable isotopes with lower energy states.
Yes. From a technical point of view, all elements have isotopes (nuclides) that are radioactive and therefore have half-lives. But the majority of these are artificial - man made, and do not occur in nature on Earth. Even hydrogen has nuclides of deuterium and tritium, deuterium is stable and natural, and tritium has a half life of 12.33 years. Having said that, there are a number of nuclides that are stable and occur naturally.
Isotopes
No they're neutron rich.