How did wave mechanical model of an atom overruled the circular orbital proposed by Bohr ?

Explanation

The wave mechanical model of an atom was proposed by Schrodinger in terms of mathematical equation known as Schrodinger wave equation. The solution of this equation gives wave function `Psi` and the square of the wave function. i.e., `Psi^2` measures the probability density of finding the electron. So, according to this model, it is possible to located the regions around the nucleus where the probability offinding the electron is maximum . These regions where the probability of finding the electron is maximum are called orbitals. Thus, wave mechanical model leads to the concept of orbital.
This concept overruled the idea of circular orbits proposed by Bohr. According to Bohr.s model of an atom, the electrons revolve around the nucleus in certian well defined circular paths called orbits. This means that electron remains only in the circular orbits at a definite distance from the nucleus. However, according to wave mechanical model, there are regions where the probability of finding the electrons is maximum. The electron may be even outside this regions.