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The Bohr Model of the Atom
Transcript of The Bohr Model of the Atom
- Rutherford’s model of the atom had shown atoms moving around the nucleus of the atom randomly
- Bohr had changed this model according to new discoveries made about the energy of an atom changing when it absorbs or emits light
- Bohr proposed that electrons travel in stationary orbits defined by their angular momentum
- Light or a photon is emitted when electrons lose energy and go down a level. This discovery allowed Bohr to create his model of the atom Niels Bohr (1885-1962) - He was born on October 7, 1885 in Copenhagen, Denmark
- Received his Ph.D. from the University of Copenhagen in 1911
- Worked at at Manchester University with Rutherford until 1916
- Returned to Copenhagen in 1916 to be a physics professor
- Awarded his Nobel Prize in physics in 1922 for his development of the atomic model
- He was a supporter of peaceful uses for atomic energy and organized the first "Atoms for Peace Conference" in 1955 The Bohr Model (Continued) Main Points:
- Electrons orbit the nucleus in orbits that have a set size and energy
- The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit
- Radiation is absorbed or emitted when an electron moves from one orbit to another
The Energy Levels of Hydrogen - Hydrogen is the lightest and simplest atom and thus ideal for the study of atomic structures
- It’s emission spectrum is very particular in interest.
-The spacing of spectral lines in the visible region formed a regular pattern.
- This pattern led J.J. Balmer, a Swiss teacher to devise a simple empirical equation from where all the visible lines in the spectrum of hydrogen can be computed.
- Balmer had found that the wavelengths of the spectral lines follow the equation...
Works Cited - Helmenstine, A. (n.d.). Bohr Model of the Atom. About.com Chemistry. Retrieved January 12, 2013, from http://chemistry.about.com/od/atomicstructure/a/bohr-model.htm
- Picture: http://the-history-of-the-atom.wikispaces.com/file/view/bohr_atom.gif/183324397/bohr_atom.gif
- Nelson 12 Physics R is a constant also known as the Rydberg Constant, value = 1.097x107 m-1.
n = Whole number greater then 2
(Each successive value for n yields a value for the wavelength of a line in the spectrum)
The Energy Levels of Hydrogen (Continued) After further studying this with ultraviolet and infrared detection, revealed that the spectrum obeyed a relationship generalizing the one devised by Balmer.
By replacing the 22 term with the squares of other integers, a more general expression is created to predict the wavelengths of all possible lines in the hydrogen spectrum...
The Energy Levels of Hydrogen (Continued) How Wave-Particle Duality Applies By: Jahid, Walid, and Mahdi Sample Problems