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The Atom

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Visible light consists of electromagnetic waves ... Fig. 8.10 The Electromagnetic Spectrum. White light is separated into its color ... – PowerPoint PPT presentation

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Title: The Atom


1
The Atom
  • Chapter 9

2
Homework AssignmentChap 9
  • Review Questions (p 187) 1 22
  • Multiple Choice Questions 1 - 3

3
Visible light consists of electromagnetic waves
Electromagnetic radiation emission and
transmission of energy in the form of
electromagnetic waves.
Fig. 8.11
Speed of light (c) in vacuum 3.00 x 108 m/s
4
Fig. 8.10 The Electromagnetic Spectrum
5
White light is separated into its
color components by a prism Fig 9.10 (a)
6
White light is separated into its
color components by a diffraction grating Fig
9.10 (b)
The tracks of a compact disc act as a diffraction
grating, producing a separation of the colors of
white light.
7

                                                                
8
Atomic Emission Spectra
9
7.3
10
First recorded emission spectrum of the sun
intensity
wavelength
11
Bohrs Conceptual Model of the Atom (1913)
Fig 9.19
e-
  1. e- can only have specific (quantized) energy
    values
  2. light is emitted as e- moves from one energy
    level to a lower energy level

n (principal quantum number) 1,2,3,
12
Fig 9.18
Egreen gt Ered
Low energy
High energy
13
(No Transcript)
14
Standing or stationary waves
Fig. 7.10
nodes
nodes
15
Fig 9.21
De Broglie (1924) reasoned that e- is both
particle and wave.
This is a matter wave, not an em wave!
16
Standing or stationary waves
Maximum probability of finding the electron
nodes
nodes
Zero probability of finding the electron
17
Dual nature of the electron
  • How can we locate a particle if it behaves as a
    wave?!
  • The uncertainty principle
  • It is impossible to know simultaneously the
    energy
  • and the position of a particle.
  • We choose to know the energy as precisely as
    possible
  • Refer to position of electron in terms of
    probability.

18
Fig 9.22 (a)
Fig 9.22 (b)
19
p orbitals
d orbitals
20
Fig 9.2
21
Part of Fig 9.27 According to the Shell Model
Valence electrons electrons in outermost shell
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