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Niels Hedrik David BohrNiels Hendrik David Bohr was one of the world-class scientists of the 20th century. The Nobel prizewinning physicist was known for his development of the theory of atomic fission that led to the development of the atomic bomb.He was born on Oct. 7, 1885, in Copenhagen, Denmark. His father, Christian, was a professor at the University of Copenhagen and his brother, Harold, was a great mathematician. Bohr and his family grew up in an atmosphere that helped the development of his knowledge. His father was largely responsible for awakening his involution in physics while, his mother came from a family well known in the field of education. After Gammelholm Grammar School in 1903, he entered Copenhagen University where He win a gold medal from the Royal Danish Academy of Sciences for his conjectural analysis of vibrations of water jets as a means of determining open tension. He received his Masters degree from the University of Copenhagen in 1909 and his docto rate in 1911 with a thesis Studies on the electron theory of metals. Bohr went to England to study with Sir J.J. Thomson at Cambridge. He had intended to spend his entire study period in Cambridge precisely when he did not get on well with Thomson so, after a meeting with Ernest Rutherford in Cambridge in December 1911, Bohr moved to Manchester in 1912. in that respect he worked with Rutherfords group on the structure of the atom. Rutherford became Bohrs role model both for his personal and scientific qualities. Using quantum ideas due to Planck and Einstein, Bohr conjectured that an atom could exist only in a discrete set of stable energy states. Bohr won the Nobel piece prize for his theory of atomic structures. According to Microsoft Encarta His work move on Rutherfords nuclear model of the atom, in which the atom is seen as a compact nucleus surrounded by a teem of much lighter electrons. He thought that electrons are arranged in definite shells, or quantum levels, at a big distance from the nucleus.