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Section 4-1 The Development of a New Atomic Model

Section 4-1 The Development of a New Atomic Model. By: Elva, Lee Ann, Elizabeth, Lorena, and Joanna. Niels Bohr. Rutherford. Properties of Light.

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Section 4-1 The Development of a New Atomic Model

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  1. Section 4-1 The Development of a New Atomic Model By: Elva, Lee Ann, Elizabeth, Lorena, and Joanna Niels Bohr Rutherford

  2. Properties of Light • The Rutherford model was an improvement but was incomplete. It didn’t explain where the atom’s negatively charged electrons are located in the space surrounding its positively charged nucleus. • Electromagnetic radiation: form of energy that has wavelike behavior • when traveling through space. • Electromagnetic radiation has a constant speed of 3.0 X 108 mps (m/s) • Electromagnetic spectrum: all the • forms of electromagnetic radiation.

  3. Rutherford Model Electromagnetic Spectrum

  4. Properties of Light Cont. • Wavelength(λ): the distance between corresponding point on adjacent waves. • Unit for wavelength-meter, centimeter, nanometer (1nm=1x10-9m) • Frequency & Wavelength equation- C=גv • C is speed of light, ג wavelength of electromagnetic wave, v is frequency of electromagnetic wave.

  5. The Photoelectric Effect • Photoelectric effect- emission of electrons from metal when light shines on metal. • Quantum-minimum quantity of energy that can be lost or gained by an atom.

  6. The Photoelectric Effect Cont. • Max Planck proposed the following equation: E=hv ( E is energy in joules, v is frequency of radiation, and h is physical constant.) • Ground state is the lowest energy state of atom. • Excited state-a state in which an atom has a higher potential energy than it has in its ground state.

  7. The Photoelectric Effect Cont. • Line-emission spectrum- bands of light • Continuous spectrum- emission of continuous range of frequencies of electromagnetic radiation.

  8. 1931-Bohr Model of the Hydrogen Atom • Danish physicist Niels Bohr solved the puzzle of the hydrogen-atom spectrum. • He proposed a model of hydrogen which links the atom’s electron with photon emission.

  9. Bibliography • Textbook- Pgs. 91-97 • Internet- http://en.wikipedia.org/wiki/Image:Bohr-atom-PAR.svg http://www.kangwon.ac.kr/~sericc/sci_lab/physics/rutherford/rutherford.html http://www.spaceandmotion.com/quantum-physics-niels-bohr-quotes.htm

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