Niels Bohr

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

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

3. Personal History • Full name: Niels HenrikDavid 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. • 1911 Doctor's degree • 1912 studied under J.J Thompson. • 1913 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 MargretheNorlund and had six children, two of them died young. • Death  Place: Copenhagen. Date: November 8, 1962

4. 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

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

6. Awards & Accomplishments • 1908  Award for an investigation of the surface tension • 1909  Master's degree in physics. • 1911  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

7. Thanks for Listening