Electron Configuration Calculator

Calculate electron configurations for any element or ion, with noble-gas notation, an orbital diagram and valence counts.

Element

Symbol, name or atomic number

Charge (optional)

Electron configuration

—

Noble gas notation

—

Valence electrons

—

Unpaired

—

Electrons per shell

—

Orbital diagramEnergy ↑

Choose an element to see its orbitals.

Formula

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