Electron Configuration Calculator
Free calculate electron configuration for any element using quantum numbers and orbital filling order.
Enter Element Data
Positive for cations, negative for anions
Results
Enter element data to calculate electron configuration
Electron Configuration Rules
Aufbau Principle
1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p
- • Electrons fill lowest energy orbitals first
- • s orbitals: 2 electrons max
- • p orbitals: 6 electrons max
- • d orbitals: 10 electrons max
- • f orbitals: 14 electrons max
Key Principles
- • Pauli Exclusion: Max 2 electrons per orbital
- • Hund's Rule: Fill orbitals singly first
- • Valence electrons determine properties
- • Noble gas notation simplifies writing
- • Ions lose/gain electrons from valence shell