Ch. 11 & 12  atomic orbital & chemical bonds  test                [120 points; 10 extra credit]

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

a. px - AO

 b. dxy - AO

2. What is an atomic orbital ?  How does it differ from the Bohr model of an atom ?  [5 points]

3. Using the short-hand notation, write the electron configuration and orbital diagram of  ___.  [20 points]

 a. Silicon

 b. Bismuth

4. In regards to the bromine atom,  [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

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

6. Which atom, magnesium or calcium, has the larger first ionization energy ?  justify / rationalize your answer.  [10 points]

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

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

a.  Sulfate ion

b. Silicon dioxide

 9. Sketch the molecular shape of CH2O.  [10 points]

10.  Using valence bond theory, describe the bonds in __.  [10 points]

 a. Hydrogen iodide

 b. Fluorine gas, F2

11. 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

3

2

 

 

 

 

 

seesaw

4

 

90º

 

5

0

 

 

 

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

Name of hybrid orbital

Bond angle(s) in hybrid orbital

Involves hybridization of __ AO

sp 2

 

 

 

 

s, p, p, p, d

 

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