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Bohr's Atomic Model was his greatest contribution to science. The Bohr model sticks the Nucleus of the atom in the center, surrounded by orbiting electrons. This was the discovery that electrons travel in orbits, and that electrons in the outer orbit tells us which element the atom is. Bohr, Niels. "Atomic models and X-ray spectra." Nature 92.2307 (1914): 553-554.
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From 1916 to 1962 he was the theoretical physics professor at the University of Copenhagen. There he founded the Institute of Theoretical Physics.
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In 1922, he was awarded the Nobel Peace Prize in Physics. He was awarded this for his contributions to the "research of atoms and the radiation it emits".
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In 1928, Bohr published his complementarity principle which states that in order to have complete knowledge on an atomic dimension, you have to know the description of both wave and particle properties. Bohr, Niels. "The quantum of action and the description of nature." Collected works (1929): 208-217.
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In 1939, he arrived at Princeton. From there he went on to work on Manhattan Project in Los Alamos, New mexico. From there he was part of a team of scientist that created the first nuclear weapon, beating the Nazis.