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Bohr Model Of Atom

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Title: Bohr Model Of Atom


1
Bohr Model Of Atom
2
Spectrum
  • Continuous spectrum is the rainbow of colors
    containing all wavelengths
  • Line spectrum contains only certain colors or
    wavelengths
  • When gases are given energy, they emit line
    spectra which are characteristic of that gas

3
  • Continuous Spectrum
  • Line Spectrum of Hydrogen

4
Niels Bohr
  • Said electrons occupy the atoms in quantized
    energy levels
  • Each level (orbit) is assigned an integer (n)
    called the principal quantum number
  • As n increases, the radius of orbit is greater

5
Energy
  • Energy of the electron depends on the level it
    occupies
  • En - RH ( 1/n2)
  • RH is called the Rydberg constant
  • RH 2.18x10-18 J

6
  • When electrons occupy the lowest possible energy
    level, they are in ground state
  • When in higher levels, they are in excited state

7
Hydrogen Line Spectrum
  • H atom absorb a quantum of energy
  • Energized electron jumps to a higher level
  • When it falls back down, it gives off energy as a
    photon of light
  • The frequency of the light depends on the levels
    it falls from and to

8
Equation
  • ?E Ef Ei
  • h? RH ( 1/nf2 - 1/ni2)
  • frequency of light given off depends on the
    level transition

9
Example 1
  • Calculate the frequency and wavelength of light
    given off when an electron in a H atom falls from
    n4 to n2. What color is it?

10
Ionization of Energy
  • Energy that would be needed to completely remove
    the electron make it go from n 1 to n 8

11
Example 2
  • Calculate the energy required to ionize an
    electron from the ground state.
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