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?
    

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

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

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

10. 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

11. 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

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

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

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

15. Complete the chart

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

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

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

19. 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.

20. 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?
     

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