Electron Configuration Calculator
Find the full electron configuration, noble-gas notation, shell distribution, and valence electrons for any element.
Enter element details
Result
Enter an atomic number or choose an element, then calculate its electron configuration.
Aufbau filling order
Electrons fill lower-energy orbitals first, following the sequence from 1s through 7p.
Orbital capacities
Each s subshell holds 2 electrons, p holds 6, d holds 10, and f holds 14.
Noble-gas notation
Shorthand notation replaces filled inner orbitals with the nearest preceding noble gas.
Frequently asked questions
What is an electron configuration?
It shows how an atom’s electrons are distributed among shells and subshells.
How are ions calculated?
Positive ions lose electrons, while negative ions gain electrons. Transition metals usually lose outer s electrons before d electrons.
What are valence electrons?
Valence electrons are the electrons in the highest occupied principal energy level.
Why do some elements have exceptions?
Some atoms shift electrons because half-filled or fully filled subshells can be more stable.
Results are estimates generated locally in your browser from standard scientific formulas and reference data. They are for informational and educational purposes only and are not a substitute for laboratory validation or professional scientific analysis. VisionVix accepts no liability for decisions based on this tool's output.
