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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.
An element is a substance composed of identical atoms. This definition was one of the cornerstones of John Dalton's atomic theory, but it too was made obsolete by the discovery of isotopes.Atoms of the same element have different numbers of neutrons in their nuclei.n other words, all atoms of an element have the same atomic number. This modern definition resolves some sticky situations encountered with older definitions: The definition above doesn't make element and mixture mutually exclusive classifications of matter.