Wize University Chemistry Textbook > Early Atomic Theory to Quantum Theory
Introduction to the Quantum Model
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Bohr Model Vs Quantum Model
What was good about the Bohr model and theory?
✔ Could predict line spectra for hydrogen and other ions with 1 electron (ex. Li2+)
❌ But it couldn't predict line spectra for species with more than 1 electron
❌ Couldn't explain how atoms were bound together
❌ Didn't explain why only certain orbits were allowed
❌ Tries to be too precise to describe where electrons are found
Bohr Theory was replaced by Quantum Mechanics!
✔ Quantum model can predict atomic spectra for many-electron atoms
✔ Quantum mechanics provides us with probabilities where electrons are most likely to be found
- Provides a 3D region where electrons are most likely to be found (instead of circular paths in Bohr model)
✔ Adds on to the Bohr model:
- Electrons are still only found at discrete energy levels with specific amounts of energy (quantized)
- In this model, each electron has 4 quantum #s that are unique to that electron and describe it.
Electron Density Diagram
