1. Chapter 8 Atoms and Periodic Properties

2. Fig. 8.1 Computer generated model of a beryllium atom p n

3. Fig. 8.2 A cathode ray tube

4. Fig. 8.3 A cathode ray tube used to discover the electron J.J. Thomson (1897)

5. Fig. 8.4 The oil-drop experiment to determine the charge on an electron Robert Millikan (1906)

6. Fig. 8.5 The gold foil experiment to determine the size of the nucleus Ernest Rutherford (1907)

7. Fig. 8.6 Alpha particles moving through gold foil

8. The size of the nucleus vs the size of the atom

9. Fig. 8.7 The three isotopes of hydrogen

10. Fig. 8.8 How atomic spectra are formed

11. Fig. 8.9 The line spectra emitted from hydrogen

12. Fig. 8.10 When an electron makes a “quantum leap” down, it emits a photon of specific energy E photon = hf

13. Fig. 8.11 Some energy levels of the hydrogen atom

14. Fig. 8.12 Fluorescent lamps contain mercury atoms