Niels Bohr received the 1922 Nobel Prize in Physics for a model of the atom that broke sharply with classical physics. He proposed that electrons orbit the nucleus only at fixed energy levels, and that they jump between them by absorbing or emitting a precise packet of light.
That single idea explained a puzzle that had defeated earlier physicists: why atoms give off light only at sharp, characteristic colours rather than a smooth spectrum. Each colour corresponds to a specific jump between levels.
Bohr's model was later absorbed into full quantum mechanics, but its core picture — quantised energy states — remains one of the most useful mental images in all of science, taught to every student of chemistry and physics.
Why it matters: Bohr turned the atom from a vague cloud into a system with rules, giving quantum theory one of its first concrete, testable pictures.
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