  We suggest a quantum black hole model that is based on an analogue to
hydrogen atoms. A self-regular Schwarzschild-AdS black hole is investigated,
where the mass density of the extreme black hole is given by the probability
density of the ground state of hydrogen atoms and the mass densities of
non-extreme black holes are given by the probability densities of excited
states with no angular momenta. Such an analogue is inclined to adopt
quantization of black hole horizons. In this way, the total mass of black holes
is quantized. Furthermore, the quantum hoop conjecture and the Correspondence
Principle are discussed.
