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Electron Configuration Writer - Online Orbital Diagram Tool

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Electron Configuration Writer

Built-in orbital diagrams, ion support, exceptions & Hund’s rule – free and instant

Frequently Asked Questions

An electron configuration shows the distribution of electrons among atomic orbitals. It uses notation like 1s² 2s² 2p⁶ to represent the shells and subshells.

An orbital diagram uses boxes or lines to represent orbitals and arrows for electrons. It visually demonstrates Hund’s rule, the Pauli exclusion principle, and electron pairing.

We use accurate ground-state configurations for all 118 elements, including exceptions like Cr [Ar] 3d⁵ 4s¹ and Cu [Ar] 3d¹⁰ 4s¹, based on experimental data.

Yes, enter the ion charge (e.g., +2 for Fe²⁺). The tool removes electrons following the correct order (4s before 3d for transition metals) to give the ion configuration.

Up arrows (↑) represent electrons with spin +½, down arrows (↓) spin −½. According to Pauli’s principle, no two electrons in the same orbital can have the same spin.

The Aufbau principle states that electrons fill lower-energy orbitals first. The order is: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

Our tool automatically counts unpaired electrons and shows them in the orbital diagram. You can also see the magnetic property (paramagnetic if unpaired > 0).
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