In Bohr Model, the electron is treated as a particle in fixed orbits around the
nucleus whereas in the Quantum Mechanical Model, the electron is treated
mathematically as a wave. The electron has properties of both particles and
waves.
The Bohr model was a
one-dimensional model that used one quantum number to describe the
distribution of electrons in the atom. The only information that was
important was the size of the orbit, which was described by “n” the principle quantum
number. Schrödinger's model (Quantum Mechanical Model) allowed
the electron to occupy three-dimensional space. It therefore required
three coordinates, or three quantum numbers, to describe the
distribution of electrons in the atom.
