Electron configuration refers to the arrangement of electrons in an atom's orbitals. Electrons occupy specific energy levels and sublevels, which are organized according to the principles of quantum mechanics. The configuration is typically represented using a notation that includes the energy level, sublevel type, and the number of electrons in that sublevel, such as 1s² 2s² 2p⁶. Understanding electron configuration is essential for predicting an element's chemical properties and behavior. The arrangement influences how atoms interact with each other, forming bonds and creating compounds. For example, the electron configuration of sodium helps explain its reactivity and role in forming sodium chloride.