Interactive Simulation -Rules to write Electronic configuration

⚛ ELECTRONIC CONFIGURATION LAB

Aufbau Principle | Hund's Rule | Pauli's Exclusion Principle

Explore how electrons are distributed in different atomic orbitals. Select an element and watch electrons enter the orbitals step by step.

1. Aufbau Principle

Electrons occupy orbitals in the increasing order of their energies. Lower-energy orbitals are filled first.

2. Hund's Rule

Electrons occupy orbitals of equal energy singly with parallel spins before pairing begins.

3. Pauli's Exclusion Principle

An orbital can accommodate a maximum of two electrons, and they must have opposite spins.

SELECT AN ELEMENT

Hydrogen (H) - 1 Helium (He) - 2 Lithium (Li) - 3 Beryllium (Be) - 4 Boron (B) - 5 Carbon (C) - 6 Nitrogen (N) - 7 Oxygen (O) - 8 Fluorine (F) - 9 Neon (Ne) - 10 Sodium (Na) - 11 Magnesium (Mg) - 12 Aluminium (Al) - 13 Silicon (Si) - 14 Phosphorus (P) - 15 Sulphur (S) - 16 Chlorine (Cl) - 17 Argon (Ar) - 18 Potassium (K) - 19 Calcium (Ca) - 20

ELEMENT INFORMATION

Electrons filled: 0

ORBITAL FILLING DIAGRAM

Blue arrow: Spin up (↑) | Red arrow: Spin down (↓)

ELECTRONIC CONFIGURATION

Select START SIMULATION

STEP-BY-STEP EXPLANATION

Start the simulation to observe the electron-filling process.

ENERGY ORDER OF ORBITALS

1s → 2s → 2p → 3s → 3p → 4s

Orbitals are filled in increasing order of energy.

TEST YOUR UNDERSTANDING

Which principle states that lower-energy orbitals fill first?