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The 36 pages that link to Hydrogen atom, each with the reason it gives.

• Schrödinger equationBroader topic: Solving the equation for its Coulomb potential predicts atomic energy levels and orbitals.

• Dirac equationRelated: Relativistic Dirac solutions refine hydrogen’s energy levels and account for fine structure.

• Erwin SchrödingerRelated: Schrödinger’s equation reproduced the hydrogen atom’s allowed energy levels without Bohr’s orbit rules.

• WavefunctionBroader topic: Its exact wavefunctions reveal quantized energy levels and orbital shapes.

• Energy levelBroader topic: Its level energies have an exact, historically decisive solution in nonrelativistic quantum mechanics.

• ReionizationRelated: Its ionization state defines what reionization means for the dominant ordinary matter between galaxies.

• Molecular hydrogenBroader topic: Two hydrogen atoms supply the nuclei and electrons that form H₂.

• 21-centimeter lineRelated: Its ground-state spin states produce the transition that emits or absorbs this radio line.

• Coulomb potentialBroader topic: Its electron experiences the Coulomb potential of the proton, forming the simplest atomic model.

• Principal quantum numberBroader topic: Its energy levels show the direct dependence of bound-state energy on n.

• Wave functionBroader topic: Its wave functions yield the atom’s orbitals and energy levels.

• Hamiltonian (quantum mechanics)Broader topic: Its Hamiltonian predicts the bound-state energies that produce the hydrogen spectrum.

• Recombination (cosmology)Broader topic: Most primordial electrons became bound to protons as neutral hydrogen formed.

• Stark effectBroader topic: Its degenerate levels produce a characteristic linear Stark effect.

• Balmer seriesNarrower topic: Its electron energy levels produce the transitions that define this series.

• Coulomb interactionBroader topic: Its bound electron and proton provide the simplest atomic example of Coulomb attraction.

• Hydrogen spectrumNarrower topic: Its single-electron structure makes the origin of the spectrum unusually tractable.

• Reduced massBroader topic: Its electron–proton relative motion uses a reduced mass slightly below the electron mass.

• Vacuum polarizationRelated: Vacuum polarization slightly shifts its energy levels, including the Lamb shift.

• Electron magnetic momentRelated: Its fine and hyperfine structure reflects the electron’s spin and magnetic interactions.

• Hydrogen ionNarrower topic: Removing its electron produces the positively charged hydrogen ion.

• Neutral hydrogenNarrower topic: Neutral hydrogen’s ground-state structure supplies the proton and electron whose spins interact.

• PositroniumCompared with: Both systems are Coulomb-bound, but positronium has equal-mass constituents and annihilates.

• Rydberg constantBroader topic: Its spectrum is the primary system in which the constant's role was established.

• Hamiltonian operatorBroader topic: Its Coulomb Hamiltonian explains the characteristic bound-state energy spectrum.

• Hydrogen-like atomBroader topic: It is the special case with nuclear charge one and no additional nuclear particles.

• Wave mechanicsBroader topic: Solving its wave equation accounts for the atom’s quantized energy spectrum.

• Azimuthal quantum numberRelated: Its exactly solvable bound states make the role of ℓ especially clear.

• Bohr radiusNarrower topic: The Bohr radius sets the characteristic spatial scale of its ground state.

• Central forceRelated: Its nonrelativistic structure is modeled by an electron in a Coulomb central potential.

• Hydrogen-alphaBroader topic: Its electron’s transition from level three to level two produces this line.

• Lyman seriesNarrower topic: Its allowed electron energies determine every wavelength in the series.

• Degenerate energy levelsBroader topic: In the nonrelativistic Coulomb model, many states with different angular momentum share an energy.

• Helium atomCompared with: Unlike hydrogen’s one-electron problem, helium requires accounting for electron-electron interaction.

• HydronCompared with: Unlike a hydron, a neutral hydrogen atom retains its electron.

• Relativistic quantum mechanicsRelated: Relativistic corrections to electron motion refine predictions of its energy levels.