The Bohr Model's Valid Domain
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The Bohr model correctly predicts hydrogen's line spectrum and other single-electron ions' spectra but fails for any atom with two or more electrons.
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Applying Bohr's method to helium fails to reproduce helium's measured spectrum, unlike hydrogen's close match.
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The Bohr model's single-electron success does not extend to multi-electron atoms — its orbits are not a general-purpose atomic model.