6. Homework 4.6
   
   1. What three methods are used to represent the arrangement of electrons in atoms?
      
   2. a) What is an octet of electrons?
      b) Which elements contain an octet of electrons?
      
   3. Write the complete electron configuration notation, the noble gas notation, and the orbital notation for the following elements:
      a) carbon
      b) neon
      c) sulfur
      
   4. Identify the elements haveing the following electron configurations:
      a) [Ar] 4s1
      b) contains four electrons in its third and outer main energy level
      c) contains on e paried and three unpaired electrons in its fourth and outer main energy level.
      
   5. a) What is meant by the highest occupied energy level in an atom?
      b) What are inner shell electrons?
      
   6. Determine the highest occupied energy level in the following elements:
      a) He
      b) Be
      c) Al
      d) Ca
      e) Sn
      
   7. Given that the electorn configuration for oxygen is 1s2 2s22p4, answer the following questions:
      a) How many electrons are in each atom?
      b) What is the atomic number of this element?
      c) Write the orbital notation for oxygen's electron configuration.
      d) How many unpaired electrons does oxygen have?
      e) What is the highest occupied energy level?
      f) How many inner shell electrons does the atom contain?
      g) In which orbital(s) are these inner shell electrons located?
      
   8. a) What are the noble gases?
      b) What is a nobel gas configuration?
      c) How does noble gas notation simplify writing an atom's electron configuration?
      
   9. Write the noble gas notation for the electron configuration of each of the elements that follow:
      a) Cl
      b) Ca
      c) Se
      
   10. Write both the complete electron fonciguration notation and the noble gas notation for each of the following elements:
       a) Na
       b) Sr
       c) P
       
   11. Identify each of the following atoms on the basis of its electron configuration:
       a) 1s2 2s2 2p1
       b) 1s2 2s2 2p5
       c) [Ne] 3s2
       d) [Ne] 3s2 3p2
       e) [Ne] 3s2 3p5
       f) [Ar] 4s1
       g) [Ar] 4s2 3d6
       

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