Niels Bohr By: Britany, Lynn, Tom, Rick, Kevin

Joke of the Day What happens when electrons lose their energy? They get Bohr'ed.

Personal History Full name: Niels Henrik David Bohr Born  Place: Copenhagen, Denmark. Date: October 7, 1885 Father: Christian Bohr, professor of Physiology at Copenhagen university Entered Copenhagen's university 1909  Master's degree in physics  Doctor's degree 1912  studied under J.J Thompson  under professor Rutherford 1916  assigned as professor of theoretical physics at Copenhagen University World war 2  escaped to Sweden Went to Los Alamos, New Mexico to advise other scientists developing the first atomic bomb, got associated with the Atomic Energy Project 1912  Married Margrethe Norlund and had six children, two of them died young. Death  Place: Copenhagen. Date: November 8, 1962

Biggest Scientific Achievement BOHR’S ATOMIC STRUCTURE 1913  Proposed the Bohr Model, based on an earlier theory of Rutherford’s model Key Ideas of Bohr’s Model: Electrons travel in discrete orbits (energy levels) around the atom’s nucleus with specific energies called stationary orbits Outer orbits hold more electrons that have greater energy than the inner ones Outer orbits can determine the chemical properties of an element, Electron configuration Described the way atoms emit radiation  when an electron jumps from an outer orbit to an inner one, it emits light Later expanded into quantum mechanics

Bohr’s Postulates- A Closer Look Rutherford’s Model Bohr’s Model ΔE=hv Ground state Excited states Nucleus Electron

Awards & Accomplishments 1908  Award for an investigation of the surface tension 1909  Master's degree in physics  Doctor's degree 1913  Published three papers on atomism 1920  Made descriptions of the periodic table 1922  Nobel Prize in Physics 1936  Described the nucleus as a compound structure 1957  first U.S. Atoms for Peace Award

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