Lecture18_Chapter18-1

Lecture18_Chapter18-1 - 10#27#2008 1 ’ecture 18 ’ecture...

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Unformatted text preview: 10#27#2008 1 ’ecture 18 ’ecture 18 ’ecture 18 ’ecture 18 ’ecture 18 ’ecture 18 ’ecture 18 ’ecture 18 Chapters 1+ Chapters 1+ Atomic Models Atomic Models Plan 1. Atoms and atomic spectra 2. The Bohr’s model 3. Atomic spectra in the Bohr’s model Home 5ork ¡ Chapter 18 ¡ ;ey Terms ¡ ?eview ¢uestions 3, £, 6,7, 10, 12 ¡ Exercises: £, 9, 10 Periodic Table 10#27#2008 2 1. Atoms and Atomic spectra ¡ Atoms are invisible because they are smaller than the wavelength of visible light! How do we explore atoms? ¡ The most close look at atoms (still indirect!) can be obtained using so- called scanning tunneling microscope (STM). STM image of a clean surface of Gold (Au). Scanning Tunneling Microscope A hot gas emits photons with the characteristic wavelengths 2. Atomic Spectra Atoms can emit and absorb only certain frequencies light! A cool gas absorbs photons with the characteristic wavelengths. Atoms can be identified by the light they emit! Iuestion: Why do atoms emit and absorb light of only certain absorb light of only certain frequencies ? 10#27#2008 3 2. Niels Bohr’s Atomic Model In 1913, Niels Bohr proposed a model that was capable to describe atomic spectra. This model is not completely correct. The correct theory of the atom is called quantum mechanics ; The Bohr Model is known as the "planetary model" of an atom....
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Lecture18_Chapter18-1 - 10#27#2008 1 ’ecture 18 ’ecture...

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