A hydrogen atom is the simplest and most abundant type of atom in the universe. It consists of just one proton in its nucleus, which is positively charged, and one electron that orbits around the nucleus, which is negatively charged. The most common isotope of hydrogen, known as protium, has no neutrons in its nucleus. ### Key Characteristics of Hydrogen Atom: 1. **Atomic Number**: Hydrogen has an atomic number of 1, indicating that it has one proton.
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A neutral hydrogen atom contains one proton and one bound electron. Its simple two-body structure makes it a central test of quantum mechanics. In the nonrelativistic Coulomb potential model, separation of center-of-mass motion leaves a relative coordinate with reduced mass . Its bound energy levels areTheir differences determine emitted or absorbed photon frequencies through . The Bohr radius gives the corresponding characteristic length scale; an energy eigenstate is a spatial wave function, rather than a classical point tracing an orbit.
Resolved spectral lines also reveal the limits of this model. Fine structure, hyperfine structure and the Lamb shift separate levels that a purely nonrelativistic Coulomb calculation leaves degenerate. The Lamb shift experiment uses a microwave-induced change of atomic state and a state-sensitive detector, showing how a small spectroscopic difference can test a much more detailed theory than the leading energy formula.