Niels Bohr David Hendrik-2428 (1885)-2505 (1962)) physics student nationals of Denmark.Born in Copenhagen graduated from the University of Copenhagen, and then went to work in England at Cambridge and Manchester City. Subsequently has served as Director of the Institute of theoretical physics, Copenhagen from 2463 (1920) till die nin bo has expanded to atomic structure theory, progress to a great. From the description of the hydrogen spectrum, how to build a model hydrogen and quantum theory (2456 (1913))