โ๏ธElectron Configuration Calculator
Full and noble-gas shorthand electron configuration for any element or ion.
Free Electron Configuration Calculator
Need an element's electron configuration without working through the Aufbau diagram by hand? Our free electron configuration calculator generates it instantly for any of the 118 elements โ or for a common ion, given its charge โ in both full and noble-gas shorthand notation.
It correctly applies known exceptions like chromium and copper, where the actual configuration differs from the naive filling order to favor a more stable half-filled or filled subshell, and explains why whenever one applies. An orbital box diagram shows how electrons fill the valence subshells according to Hund's rule, and the valence electron count is called out separately.
Built for chemistry coursework and quick lookups, it runs entirely in your browser. No sign-up, no downloads, no limits.
About the Electron Configuration Calculator
Features
Full and shorthand notation
Standard notation plus condensed noble-gas core notation.
Ion support
Enter a charge to compute cation or anion configurations correctly.
Aufbau exceptions
Known exceptions like Cr and Cu are handled explicitly, with an explanation.
Orbital diagram
Box notation for the valence subshells showing Hund's rule.
Frequently Asked Questions
How does the electron configuration calculator work?
Pick an element by name, symbol, or atomic number, and it generates the configuration using the Aufbau filling order, correcting for known exceptions.
Is it free?
Completely free, no sign-up, downloads, or limits.
Does it handle ions?
Yes, enter a charge (e.g. 3 for Fe3+) and it computes the ion's configuration using the correct electron-removal order.
Does it give shorthand notation?
Yes, both full notation and noble-gas shorthand are shown.
What are the "exceptions" it mentions?
Elements like chromium and copper don't follow the naive Aufbau prediction because a half-filled or fully filled d-subshell is more stable โ the calculator applies the correct actual configuration and explains why.
Does it show an orbital diagram?
Yes, a box-notation diagram for the valence subshells showing Hund's rule.
Does it show valence electrons?
Yes, called out separately from the full configuration.
What if I enter an invalid element or impossible ion charge?
It's flagged clearly rather than producing a wrong configuration.
Is my data stored?
No; everything runs in your browser and isn't stored or sent anywhere.
Does it work on mobile?
Yes, fully responsive on all screen sizes.