Atomic Physics
Nuclear physics is the science of the components of the atomic nucleus, that is, protons and neutrons, and related basic particles.
Chemistry is the science of the interaction between atoms. In chemistry, assuming that the nucleus of each atom does not change. Instead, atoms are assembled by sharing electrons to form molecules.
The interactions that separate the atomic nuclei, or bind them together, are part of nuclear physics. Initially, back in about 1920, the known particles were protons, neutrons, and electrons. Nuclear physics, sometimes called particle physics, now has a Standard Model with 17 particles. Most recently acquired by Higgs Boson.
For example, protons and neutrons are made up of three quarks. All nuclear communications are controlled by two forces, the major nuclear forces and the weak nuclear forces. I will not go into the particle text above here.
Nuclear physics also describes nuclear fusion that enables solar energy and makes H-bombs; and nuclear fission that generates nuclear power plants and is used to make A-bombs. It also explains why some atoms have radiation and how events are similar to the radiation activity of radio carbon.
Nuclear, or particle, physics is also related to quantum physics. The actions of nuclear particles cannot be explained if we see them only as particles; some of their structures make sense only when we see them as waves that have no place. When we look at nuclear energy and particles like waves and particles, we move the fields from nuclear physics (or particle) to quantum physics.
If we look at particle physics of astronomical objects, such as stars, galaxies, and black holes, that is astrophysics.
If we look at how nuclear physics interacts with chemical reactions, that is chemical chemistry. For example, the uranium filtration process to increase the isotope ratio U-235 to U-235, which is essential for the production of nuclear energy uranium rods, uses thermal molecular weight chemistry and the nuclear element for differentiating weight isotopes of the same substance.
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