About Electron Configuration

Electron configuration describes the distribution of electrons in an atom's atomic orbitals. It follows the standard notation where the energy levels and sublevels are specified with the number of electrons in each sublevel written as a superscript.

How to Use This Calculator

1. Enter any element name (e.g., "Sodium") or atomic number (e.g., "11") in the input field
2. Click the "Calculate" button
3. View the complete and abbreviated electron configuration in the results section

Electron Configuration Rules

• Pauli Exclusion Principle: No two electrons can have the same set of quantum numbers
• Aufbau Principle: Electrons occupy the lowest energy orbitals available
• Hund's Rule: Orbitals of equal energy are occupied by one electron before any is occupied by a second electron

Electron Configuration Formula

The general electron configuration follows this pattern:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d¹⁰ 7p⁶

This represents the order in which orbitals are filled according to the Madelung rule (n + ℓ rule).