5. Homework 4.5
   
   1. a) What is an atom's electron configuration?
      b) What three principles guide the electron configuration of an atom?
      
   2. Identify the elements having the following electron configurations:
      a) 1s2 2s2 2p6 3s2 3p3
      
   3. a) Give the statement of Hund's Rule.
      b) What is the basis for this rule?
      
   4. a) Give the statement of Pauli's Exclusion Principle.
      b) What is the significance of the spin quantum number?
      c) Compare the values of the spin quantum number for two electrons int he same orbital.
      
   5. Write the orbital notation for the following elements:
      a) P
      b) B
      c) Na
      d) C
      
   6. Write the electron configuration notation for an unidentified element that contains the following number of electrons:
      a) 3
      b) 6
      c) 8
      d) 13
      

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