Electron Configuration Calculator

Calculate full and noble-gas configurations, orbital diagrams and valence counts for any element or ion.

Element

Quick picks

Electron configuration

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Noble gas notation

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Valence electrons

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Unpaired

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Electrons per shell

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Orbital diagram — energy upward, core collapsed

Choose an element to see its orbitals.

Aufbau order: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p · Hund’s rule: singly fill degenerate orbitals before pairing