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Exploring the Bohr Model: Atom's Light Spectra & Energy Levels

Discover the Bohr Model of the atom, where electrons orbit the nucleus in quantized energy levels, emitting light when transitioning orbits. Learn about ground and excited states, absorption and emission spectra, and the fascinating process that produces these spectra within atoms.

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Exploring the Bohr Model: Atom's Light Spectra & Energy Levels

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  1. Chapter 4 The Bohr Model of the Atom

  2. Visible Light

  3. Niels Bohr • In 1913 Bohr published a theory about the structure of the atom based on an earlier theory of Rutherford's. • Bohr expanded upon this theory by proposing that electrons travel only in certain successively larger orbits.

  4. Bohr Model of the Atom • Electrons orbit the nucleus in orbits that represent specific quantities of energy. • The energies of the electrons in the atom are quantized. • Only certain electron orbits (energy levels) are allowed. The Bohr Atom

  5. Niels Bohr • Bohr also described the way atoms emit radiation by suggesting that when an electron jumps from an outer orbit to an inner one, that it emits light.

  6. Ground State • The lowest energy state of an atom.

  7. Excited State • Any energy state of an atom that is higher in energy than the ground state.

  8. Energy Absorbed

  9. Absorption (Dark – Line) Spectra

  10. Energy Emitted Electron jumps to a lower orbit

  11. Emission (Bright – Line) Spectra

  12. Emission Spectra

  13. The lines present in an emission spectrum are the lines missing in an absorption spectrum.

  14. Describe the process that occurs inside atoms that produces the spectra? • Energy is absorbed by the atom. • The electrons jump into higher orbits and the atom becomes “excited”. • The electrons return to their original orbits and the atom returns to the ground state. • The electrons release energy in the form of visible light. • The specific energies (wavelengths, frequencies) of visible light absorbed and released produce the spectra.

  15. Homework • Chapter 4: Worksheet 2 (due tomorrow). • Lab Summary: Flame Tests (due Thursday). • Study Guide Chapter 4 (due Friday).

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