Ch. 11 & 12  atomic orbital & chemical bonds  test                [85 points]

You may use your notes, homework assignment, and a periodic table during the test.

 1. Sketch the following atomic orbitals and show its relationship with the x-, y-, and / or z- axis.  [10 points]

a. pz - AO

b. dxz - AO

2.  Using the short-hand notation, write the electron configuration and orbital diagram of arsenic.  [10 points]

3. In regards to the arsenic atom,  [hint:  see your answer to # 2; 15 points]

a.  identify the valence electrons

 b. identify the core electrons (or inner shell electrons or kernel electrons)

 c. identify the electrons involved in a chemical bond

4. Which atom, sodium or aluminum, has the larger atomic size ?  justify / rationalize your answer.  [10 points]

5. In regards to electronegativity,  [10 points]

a.  Define / describe the term  [4 points]

b.  What is the relationship between the difference in electronegativity between two atom and the type of chemical bonds (i.e. ionic-, polar covalent-, or nonpolar covalent- bond) between the atoms ?  [6 points]

6. Sketch all Lewis structure(s) of  ___.  [10 points]

a. Sulfate ion

b. Silicon dioxide

7. Is SF4 a polar or nonpolar compound ?  Justify your response.  [10 points]

8. Fill-in the below table.  [10 points]

# bonding pair electrons on the central atom

# nonbonding pair electrons on the central atom

Bond angle(s)

Name of molecule’s shape