Atoms and

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Atoms and Periodic Properties
Chapter 8
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Fig. 8.1 Computer generated model of a beryllium
atom
n
p
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Fig. 8.2 A cathode ray tube
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Fig. 8.3 A cathode ray tube used to discover the
electron
J.J. Thomson (1897)
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Fig. 8.4 The oil-drop experiment to determine
the charge on an electron
Robert Millikan (1906)
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Fig. 8.5 The gold foil experiment to determine
the size of the nucleus
Ernest Rutherford (1907)
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Fig. 8.6 Alpha particles moving through gold foil
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The size of the nucleus vs the size of the atom
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Fig. 8.7 The three isotopes of hydrogen
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Fig. 8.8 How atomic spectra are formed
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Fig. 8.9 The line spectra emitted from hydrogen
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Fig. 8.10 When an electron makes a quantum
leap down, it emits a photon of specific energy
Ephoton hf
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Fig. 8.11 Some energy levels of the hydrogen atom
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Fig. 8.12 Fluorescent lamps contain mercury atoms