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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.
1 Atom is a smallest particle of an element. 2  Molecule is a group of two or more atoms combined together so it is bigger. 3  Atom consists of nucleus (containing protons and neutrons) and electrons. 4  Molecule consists of combination of two or more like or different atoms chemically bound together e.g.