Electron Configuration Calculator: Complete Guide for All Elements

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

1. Select any element from the dropdown (hydrogen to oganesson)

2. Instant results show:

   • Full electron configuration

   • Valence electrons

   • Atomic number and mass

   • Proper orbital filling order

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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