As we learned in section
3.3.1, the Bohr model establishes the concept of definite electron energy
levels within atoms. But Bohr's model was rather simplistic and as scientists
made more discoveries about more complex atoms, Bohr's model was modified and
eventually was replaced by more sophisticated models.

The Quantum Mechanical Model
of the atom presents a more accurate model of the atom. It is a more sophisticated
model based on complex mathematical calculations and interpretations. We will
take a look at this model and summarize the results based on these mathematical
calculations without carrying them out ourselves.

The Quantum
Mechanical Model introduces the concept of: