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Atomic structure definition, the structure of an atom, theoretically consisting of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus, the constitution of the nucleus and the arrangement of the electrons differing with various chemical elements. See more.
The arrangement of electrons in an atom is called its electronic structure. The electronic structure of an atom refers not only to the number of electrons that an atom possesses but also to their distribution around the nucleus and to their energies. As we will see, electrons do not behave like anything we are familiar with in the macroscopic world. Our knowledge of electronic structure is the result of one of the major developments of twentieth-century science, the quantum theory.