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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.
Atom Definition. Chemistry Glossary Definition of Atom. This is a basic diagram of an atom, with protons, neutrons and electrons labeled. AhmadSherif, Wikipedia Commons. Anne Marie Helmenstine, Ph.D.tom Definition: An atom is the defining structure of an element, which cannot be broken by any chemical means.