Electron Configuration Generator
Generate the electron configuration for any element by atomic number. Follows the Aufbau principle to fill s, p, d, and f orbitals.
Inputs
Results
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d6
Valence Electrons
2
How to Use This Calculator
- Enter the atomic number of the element (1–118).
- The calculator applies the Aufbau principle with Madelung energy ordering.
- Review the full electron configuration string and orbital filling order.
- Use this to predict chemical reactivity, valence electron count, and period/group placement.
What each input means
- Atomic Number (Z)
- Atomic number of the element (1 = Hydrogen, 26 = Iron, 79 = Gold)
How this is calculated
Formula
Aufbau: 1s → 2s → 2p → 3s → 3p → 4s → 3d → ...Worked example, using the default values
- Identify Input ParametersAtomic Number (Z) = 26 = 1 input(s) provided
- Calculate Electron ConfigurationElectron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d6 = 1s2 2s2 2p6 3s2 3p6 4s2 3d6
- Calculate Valence ElectronsValence Electrons2 = 2
- Calculate Total ElectronsTotal Electrons = Z26 = 26
- Calculate Core ElectronsCore Electrons24 = 24
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