Electron Configuration Calculator
Discover the precise electron arrangement of any atom with our comprehensive calculator. Perfect for chemistry students, researchers, and educators.
How to Use This Electron Configuration Tool
- Select any element from the dropdown (hydrogen to oganesson)
- Instant results show:
- Full electron configuration
- Valence electrons
- Atomic number and mass
- Proper orbital filling order
Why Our Calculator Stands Out
100% Accurate - Verified configurations including exceptions (Cr, Cu, etc.)
All 118 Elements - Covers every discovered element
Educational Format - Clear valence electron highlighting
Mobile-Friendly - Works perfectly on all devices
Understanding Electron Configurations
Electron configurations describe how electrons are distributed in an atom's orbitals. Our calculator helps you:
- Predict chemical behavior (valence electrons determine reactivity)
- Understand periodic trends (see how configurations change across periods)
- Master exceptions (like chromium's 4s¹3d⁵ configuration)
Common Academic Uses
- Homework Help: Quickly verify configurations for assignments
- Lab Work: Reference atomic properties during experiments
- Test Prep: Study for AP Chemistry, MCAT, or other exams
- Research: Access data for all elements including transuranics
Key Features Explained
1. Full Electron Configuration
Shows the complete orbital filling order according to:
- Aufbau principle
- Pauli exclusion principle
- Hund's rule
Example: Iron (Fe) = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
2. Valence Electrons
Identifies the outermost electrons that participate in bonding:
- Main group elements: Outer s/p electrons
- Transition metals: Includes d electrons
- Lanthanides/Actinides: Includes f electrons
3. Atomic Data
Includes IUPAC-standard:
- Atomic numbers
- Atomic masses
- Element names/symbols
Periodic Table Trends
Our calculator reveals important patterns:
- Group Similarities: Elements in the same column have analogous valence configurations
- Periodic Changes: Observe how orbitals fill across periods
- Block Organization: Clearly see s-, p-, d-, and f-block characteristics
FAQ Section
Why do some elements have irregular configurations?
Certain atoms achieve greater stability by half-filled or fully-filled d orbitals (e.g., Cr, Cu, Ag).
How are f-block elements different?
Lanthanides and actinides fill 4f and 5f orbitals, creating unique chemical properties.
Can I predict an element's reactivity with this?
Yes! Valence electrons determine chemical behavior:
- Alkali metals (1 valence e⁻) = highly reactive
- Noble gases (full valence) = inert