Name:

1. What did each of the following scientists contribute in forming the
      modern model of the atom?

a. John Dalton
   

b. J.J. Thomson
   

c. Ernest Rutherford
  

g. Robert Millikan
   

j. Neils Bohr
  

2. What are the major points in Dalton's atomic theory?
     

3. What are cathode rays? Why are they called cathode rays?
     

4. What are the differences in charge and mass among protons,
      neutrons, and electrons?
     

5. A particular atom of potassium contains 19 protons, 19 electrons, and
     20 neutrons. What is the atomic number of this atom? What is the
     mass  number?
    

6. How many electron, neutrons and protons are there in an atom of
     chlorine with a mass number of 35? How many of each are in the
     atoms thorium with a mass number of 232?
    

9. Describe the way that excited atoms produce an emission
     spectrum 
    

10. How did Bohr use spectroscopic data to formulate his model of the
     atom?
    

11. According to Bohr, what happens when an electron absorbs a
     photon?
    

12. What is the energy of a quantum of light of frequency 4.31 x 10¹⁴ Hz?

1.11 x 10^-15 J

2.67 x 10^-19 J

6.69 x 10^-19 J

2.86 x 10^-19 J

13. A certain violet light has a wavelength of 4.13 X 10^-7 m. What is the
     frequency of the light? The velocity of light is 3.00 x 10⁸ m/s

7.88 x 10¹⁶ Hz

1.09 x 10¹⁹ Hz

7.26 x 10¹⁴ Hz

4.86 x 10¹⁶ Hz

14. What is the energy content of  one quantum of the light in problem
     45?

3.97 x 10^-17 J

4.81 x 10^-19 J

5.52 x 10^-17 J

6.31 x 10^-19 J

15. Explain why people need protection from from ultraviolet
     radiation, particularly short wavelength ultraviolet radiation.
    

17. What is meant by the wave-particle duality of nature?
     

19. Explain what it is that the four quantum numbers represent.
    
      

21. Complete the chart

22. What are the possible values for the fourth quantum number? What
      do these numbers represent?
     

23. State the Pauli Exclusion Principle. What does this principle tell us
      about two electrons occupying the same orbital?
     

24. What elements are composed of atoms having the following electron
      configurations?
     

25. Draw electron (Lewis) dot diagrams for the elements with Z equal
      to 7, 15, 33, 51 and 83
      Sorry folks, this one you have to do on paper.

26. Selenium (Z = 34) was discovered by Berzelius in 1817. Write its
      electron configuration and its dot diagram.
      This also must be done on paper.

27. An atom's electron configuration ends in 5s²4d¹⁰5p⁴. Identify the
     element and write its electron configuration.
     Yep, this one too.

28. Explain why Heisenberg's uncertainty principle has a great effect
     on our ability to observe electrons and other very small particles.
    

29. When an electron moves from the n = 2 to the n = 4 state, does it
      gain or lose energy? Is a photon emitted or absorbed?
     

30. In the electron dot diagram for nitrogen, electrons from which
     orbitals are shown? Which electrons are not shown?
    

31. Draw electron dot diagrams for sodium (Z = 11) and chlorine (Z = 17).
     Can you explain how they might combine to form a compound?
    

    Identify the movie that this clip comes from: click