Hydrogen atom orbitals

Probability densities for the first few hydrogen atom orbitals, seen in cross-section. The energy level of a bound electron determines the orbital it occupies, and the color shows the probability that the electron will be seen near a position.
Hydrogen Wave function Simulation
“ An electron can be bound to the nucleus of an atom by the attractive coulomb force. The wave-like behavior of a bound electron is described by a function called an atomic orbital. An orbital consists of a set of quantum states that have a particular energy, and only a discrete set of these orbitals exist around the nucleus. Electrons can transfer between different orbitals by the emission or absorption of photons with an energy that matches the difference in potential. ”