Electron Configuration Calculator
Determine the electron configuration of any element based on its atomic number and charge state.
Fe (neutral)
Full Configuration:
1s2 2s2 2p6 3s2 3p6 4s2 3d6
Noble Gas Notation:
[Ar] 4s2 3d6
Total Electrons:
26
Valence Electrons:
8
How It Works
Electrons fill orbitals following the Aufbau principle, from lowest to highest energy. The order is: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. Each s orbital holds 2 electrons, p holds 6, d holds 10, and f holds 14.
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Chemistry: The Central Science
by Brown, LeMay, Bursten
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.