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Electron Configuration Calculator
Determine the orbital electron configuration for any element (Z = 1 to 118)
Aufbau Principle: Orbitals are filled in order of increasing energy ($1s, 2s, 2p, 3s, 3p, 4s, 3d, \dots$). Enter any atomic number ($Z$) from 1 to 118.
Element Input
Electron Configuration
⚠️ Certain transition and inner-transition metals (such as Cr, Cu, Ag, Au) exhibit experimental exceptions to the Madelung energy-ordering rule due to the stability of half-filled and fully-filled subshells. This tool provides standard Aufbau configurations.