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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 modern view about the structure of atom suggests. 1  Inside the nucleus, protons and neutrons are present which are collectively called nucleons. 2  The electrons are revolving around the nucleus in fixed orbits. 3  The mass of an atom is concentrated inside the nucleus of an atom. 4  Atom is electrically neutral.