alleryThe Bohr model failed to explain
Athe Rydberg constant
Bthe hydrogen spectrum
Cfine structure / spectra of multi-electron atoms
Dthe ionisation energy of H
Answer & Solution
Correct answer: C. fine structure / spectra of multi-electron atoms
Bohr's circular-orbit model worked beautifully for H and H-like ions but failed for multi-electron atoms, the splitting of spectral lines under magnetic fields (Zeeman), and the fine structure within lines.
Quantum mechanics (Schrödinger, Heisenberg) replaced it.
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