Electronic configuration is defined as the arrangement of electrons around a nucleus in discrete energy shells and subshells (orbitals) that determines an atom's chemical properties. This theoretical framework relies on three governing principles: the Aufbau principle, which mandates filling orbitals from lowest to highest energy; the $2n^2$ capacity rule limiting total electron occupancy per principal shell; and the octet rule restricting valence shells to a maximum of eight electrons (except for the single exception where the first K-shell is limited to two). As a foundational concept in quantum chemistry, it provides the necessary structural description required to predict atomic stability and reactivity based on nuclear charge and electron count.
Electronic configuration is defined as the arrangement of electrons around a nucleus in discrete energy shells and subshells (orbitals) that determines an atom's chemical properties. This theoretical…