4. Homework 4.4
   
   1. Define the following:
      a) main energy level;
      b) quantum numbers
      
   2. a) List the four quantum numbers.
      b) What general information about atomic orbitals is provided by the quantum numbers?
      
   3. Describe briefly what specific information is given by each of the four quantum numbers and indicate the symbol for each.
      
   4. How many electrons could be contained in the following main energy levels with n equal to:
      a) 1
      b) 3
      c) 4
      d) 6
      e) 7
      
   5. a) What is an orbital?
      b) Describe an orbital in terms of an electron cloud.
      

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