What is the Electron Configuration Generator?
Generate electron configurations for elements 1–118 from their symbols. This tool applies the Aufbau (Madelung) filling order and includes common ground-state exceptions (e.g. Cr, Cu, Ag, Au). Output includes full configuration, noble-gas shorthand, valence electron count, and an orbital breakdown table. Runs instantly in your browser with no signup.
How to use the Electron Configuration Generator
- Enter an element symbol (e.g. Fe, Cl, Cu).
- Read the noble-gas shorthand configuration in the results panel.
- Review the full configuration and orbital electron counts.
- Note valence electrons and any Aufbau exceptions flagged.
- Copy the configuration for notes or homework.
Common use cases
- Getting [Ar] 4s² 3d⁶ for iron in general chemistry
- Checking Cr and Cu exception configurations
- Building orbital diagrams from subshell electron counts
Frequently asked questions
- What is electron configuration?
- It describes how electrons occupy atomic orbitals (1s, 2s, 2p, …) in an atom. Example: carbon is 1s² 2s² 2p², or [He] 2s² 2p².
- What is noble-gas notation?
- The core electrons are replaced by the previous noble gas in brackets. Iron is [Ar] 4s² 3d⁶ instead of writing 1s² through 3p⁶.
- Why are Cr and Cu different from Aufbau predictions?
- Half-filled and fully filled d subshells are extra stable. Cr is [Ar] 4s¹ 3d⁵ and Cu is [Ar] 4s¹ 3d¹⁰, not 4s² 3d⁴ and 4s² 3d⁹.
- Are superheavy elements accurate?
- Configurations for elements beyond the actinides are predicted; experimental data may refine them.
