Atomic physics is the study of the structure, properties, and behavior of matter at the atomic and subatomic levels. It investigates the components of atoms, including protons, neutrons, and electrons, and examines the fundamental forces that govern their interactions. A core principle of the field is the quantization of energy, which dictates that electrons exist in discrete energy levels within an atom's shell. Research in this area explores nuclear stability, radioactive decay processes, and the mechanisms by which subatomic particles interact through forces such as the strong, weak, and electromagnetic forces. The principles derived from atomic physics form the basis for modern understanding of matter, chemistry, and many technologies that utilize controlled atomic interactions.