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This timeline details the contributions of Niels Bohr to the world of physics and mathematics.
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Niels Bohr postulated that "...electrons could only occupy particular orbits determined by the quantum of action and that electromagnetic radiation from an atom occurred only when an electron jumped to a lower-energy orbit." (Nobel Media) This is the current-day model of the atom, with a nucleus and levels of orbits of electrons.
Hank Green on Niels Bohr -
He, along with Werner Heisenberg and Max Born, developed the Copenhagen interpretation of quantum mechanics (Aaserud), which involved the correspondence principle, statistical interpretation of the wave function, and complementarity.
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Bohr developed the theory of the nucleus of an atom being a compound structure. This would describe the atom as being not simply a nucleus and electrons, but the nucleus also being comprised of protons and neutrons.
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Partially due to Bohr's theory on the compound nucleus, "Otto Hahn and Fritz Strassmann were able to discover a new element (Barium) by bombarding uranium with neutrons." ("Niels Bohr Announces the Discovery of Fission")
