Niels Bohr   1885—1962   Danish physicist   Atomic structure electrons orbit around nucleus   Number of electrons determine chemical properties of element   Electrons emit photons of discrete energy, basis of quantum theory   Principle of complementarity, items can be seen as having properties that seem contradictory   For example light as both stream of particles and wave   Nobel Prize in physics 1922 for Copenhagen interpretation of quantum mechanics   Escaped German-occupied Denmark in 1943 went to Sweden, England and United States   Worked at Los Alamos New Mexico laboratory on the Manhattan Project   After World War II returned to Copenhagen advocating peaceful use of nuclear energy   The element bohrium is named in his honor

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