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Bohr’s atomic model, proposed by Danish physicist Niels Bohr in 1913, describes the structure of atoms as a central nucleus composed of protons and neutrons, surrounded by electrons in orbits around the nucleus. The electrons occupy specific energy levels, or shells, and the transitions between shells give rise to the emission or absorption of electromagnetic radiation. The model was a significant improvement over earlier models, such as Thomson’s “plum pudding” model, and helped to explain the spectral lines observed in atomic spectra. However, it was later superseded by quantum mechanics and is no longer considered a completely accurate representation of the behavior of electrons in atoms.