"Rutherford\u2013Bohr model" . "orbital theory" . "Bohr orbits" . "Bohr orbital" . "Sommerfeld-Bohr theory" . "electron energy levels" . "theory of the hydrogen atom" . "the model of the atom" . "Bohr model#Refinements" . "Niels Bohr's theory" . . "semiclassical model" . "Model of the atom" . "semiclassical Bohr model of the atom" . "his model of the atom" . "early conjecture" . "Bohr orbit" . "a new model of the atom" . "Sommerfeld-Bohr model" . . . "atomic structure" . "Bohr\u2013Sommerfeld model" . "Bohr model of the hydrogen atom" . "shell" . "Niels Bohr's model of the atom" . "Bohr\u2019s model" . . "more complex models" . "atomic model" . . "his model" . "hydrogen atom" . "his atom model" . . "Atomic model" . . "Bohr\u2013Sommerfeld atomic model" . "model" . "Bohr-Sommerfeld model" . . "Bohr's model of the atom" . "model of the hydrogen atom" . "Sommerfeld model" . "Bohr" . "Bohr's theory" . "Bohr model of the atom" . . "Bohr model" . "Bohr's model" . . "Bohr model for atoms" . "quantum theory of the hydrogen atom" . "model of the atom" . "Bohr atomic model" . "Bohr atom theory" . "quantum theory" . "Bohr model" . "quantum model of the atom" . "atomic theories" . "Bohr Sommerfeld" . "nuclear model" . . "Bohr's atomic model" . "Rutherford\u2013Bohr quantum model" . . "atom" . "Bohr atom" . . "theoretical model" . . "Bohr quantization" . "1913 model" . "Bohr Correspondence" . "spectrum of the hydrogen atom" . "Bohr velocity" . . .