Bohr applied the quantum theory to Rutherford experiments. This helped him to discover shells around the nucleus of the atom. "Neils Bohr postulated based on quantum theory that electrons travel around an atomic nucleus in a stationary orbit. His work also led to the theory of different energy levels in atoms, that is if an electron drops from a higher to a lower orbit, it must release energy."
Shells Added to the atom
As you can see, the shells and levels that Niels Bohr discovered are visible in this model.