SEARCH Articles Figures Tables Atomic Orbitals A Quantum Mechanical Description of Electrons Around the Nucleus Atoms The Quantum World Background quantum mechanics in the atomic context Early Quantum Mechanics The Atom NIELS BOHR USED THE QUANTUM HYPOTHESIS TO EXPLAIN ATOMIC SPECTRA Quantum Conditions in the Atom Quantum Mechanics Model Systems and the Hydrogen Atom Quantum Mechanics and the Atom Quantum Theory and the Atom Quantum Theory and the Electronic Structure of Atoms Quantum Theory of the Hydrogen Atom Quantum mechanical model of the atom Quantum mechanics energy levels in the hydrogen atom Quantum mechanics model of the atom Quantum model of the atom Quantum theory of the atom Quantum-mechanical Description of the Quadrivalent Carbon Atom The Quantum Mechanical Atom Principal Shells, Subshells, and Orbitals The Quantum-Mechanical Model Atoms with Orbitals The introduction of quantum mechanics atomic orbitals and orbital energies