Niels BohrBy: 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. • 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 Margrethe Norlund and had six children, two of them died young.

• Death Place: Copenhagen. Date: November 8, 1962

Biggest Scientific AchievementBOHR’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=hvGround state

Excited states

Nucleus

Electron

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

Thanks for Listening