Energy Level Diagram Generator Energy Level Diagrams
Describe an atom, electron configuration, or chemical reaction and get a clean, labeled energy level diagram in seconds. Orbital filling, electron transitions, reaction energy profiles, and more.
Energy Level Diagram Generator
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Energy Level Diagram Examples
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Electron Configuration Orbital Diagram
Orbital filling diagram with 1s through 3p subshells, each box labeled and filled with spin-up and spin-down arrows per Aufbau and Hund's rules.
Atomic Energy Levels with Electron Transitions
Four principal energy levels for hydrogen (n=1 to n=4) with upward absorption arrows and downward photon-emission arrows labeled with wavelengths.
Aufbau Orbital Filling Diagram
The Aufbau diagonal filling order from 1s to 5s, with diagonal arrows showing the sequence electrons fill subshells.
Exothermic Reaction Energy Profile
Reaction coordinate curve for an exothermic reaction with reactants, transition state peak, products, activation energy (Ea), and negative delta H labeled.
Endothermic Reaction Energy Profile
Reaction coordinate curve for an endothermic reaction showing reactants below products and a positive enthalpy change.
Carbon Atom Energy Level Diagram
Energy level diagram for carbon (Z=6) with electrons placed in 1s, 2s, and 2p subshells following Hund's rule, showing two unpaired electrons in 2p.
What is an energy level diagram?
An energy level diagram is a visual representation of the discrete energy states that electrons can occupy within an atom, molecule, or during a chemical reaction. In atomic diagrams, horizontal lines stacked on a vertical energy axis represent subshells (1s, 2s, 2p, and so on), and arrows show electrons placed in those shells following the Aufbau principle, Hund's rule, and the Pauli exclusion principle. In reaction energy profile diagrams, the same vertical axis tracks the potential energy of a system as it moves along a reaction coordinate, revealing the activation energy and the enthalpy change for exothermic and endothermic reactions. Figviz generates both types from a plain text description, so you get a clean, labeled diagram without drawing by hand.
How to make an energy level diagram
Electron configuration diagrams vs reaction energy profiles
Electron configuration diagrams (sometimes called orbital box diagrams) show how electrons are distributed across subshells at a single point in time. They follow three rules: Aufbau (fill lowest energy first), Hund's rule (one electron per orbital before pairing), and the Pauli exclusion principle (no two electrons with the same four quantum numbers). Reaction energy profiles, by contrast, show how the total potential energy of a chemical system changes along the reaction coordinate from reactants to products. The peak of the curve is the transition state, and the height of that peak above the reactants is the activation energy. The net difference between reactants and products is the enthalpy change, delta H, which is negative for exothermic reactions and positive for endothermic ones.
Tips: Aufbau, Hund's rule, and Pauli
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