Linked from
The 69 pages that link to Atomic orbital, each with the reason it gives.
Bohr radiusNarrower topic: The Bohr radius supplies the natural length unit for hydrogenic orbitals.
Robert S. MullikenRelated: Mulliken’s molecular orbitals were constructed from atomic orbitals.
Valence shellRelated: Orbitals within the outermost shell hold its valence electrons.
Triple bondRelated: Orbital overlap provides the quantum-mechanical basis for shared electron pairs.
Orbital hybridisationNarrower topic: Hybridisation combines atomic orbitals on the same atom.