Name: 
 

Bonding & Molecular Structure


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
For an atom of a main group element, the number of valence electrons is equal to
a.
its number of core electrons.
b.
the principle quantum number of its outer shell.
c.
its period number.
d.
its group number.
e.
eight minus its group number.
 

 2. 
What is the expected number of valence electrons for an atom of a group 6A element?
a.
0
b.
1
c.
2
d.
4
e.
6
 

 3. 
A silicon atom has ____ valence electrons.
a.
0
b.
2
c.
4
d.
6
e.
10
 

 4. 
Which of the following statements are CORRECT?


1.
Ionic bonds form when one or more valence electrons are transferred from one atom to another.
2.
Covalent bonds involve sharing of electrons between atoms.
3.
Ionic bond formation is always exothermic; covalent bond formation is always endothermic.
a.
1 only
b.
2 only
c.
3 only
d.
1 and 2
e.
1, 2, and 3
 

 5. 
Which of the following compounds is expected to have the strongest ionic bonds?
a.
MgO
b.
KBr
c.
NaI
d.
SrO
e.
CaS
 

 6. 
What is the total number of valence electrons in a carbon dioxide molecule?
a.
4
b.
8
c.
16
d.
20
e.
22
 

 7. 
How many lone-pair electrons are on the carbon atom in CO2?
a.
0
b.
1
c.
2
d.
3
e.
4
 

 8. 
Which of the following is a correct Lewis structure for ozone, O3?

molecstructure_files/i0090000.jpg
a.
1
b.
2
c.
3
d.
4
e.
5
 

 9. 
Which of the following are resonance structures for sulfur dioxide, SO2?

molecstructure_files/i0100000.jpg
a.
1 and 2
b.
2 and 4
c.
3 and 4
d.
1, 2, and 3
e.
2, 3, and 4
 

 10. 
Use VSEPR theory to predict the molecular geometry of H3O+.
a.
trigonal-pyramidal
b.
trigonal-planar
c.
bent
d.
T-shaped
e.
linear
 

 11. 
Use VSEPR theory to predict the molecular geometry of CS2.
a.
linear
b.
bent
c.
trigonal-planar
d.
tetrahedral
e.
octahedral
 

 12. 
Use VSEPR theory to predict the molecular geometry of CO32-.
a.
bent
b.
tetrahedral
c.
trigonal-pyramidal
d.
T-shaped
e.
trigonal-planar
 

 13. 
What is the bond angle in N2O?
a.
90°
b.
107°
c.
109.5°
d.
120°
e.
180°
 

 14. 
Predict which of the following compounds will have the most polar covalent bond(s).
a.
HF
b.
CBr4
c.
H2S
d.
NCl3
e.
HI
 

 15. 
In molecules, as bond order increases,
a.
both bond length and bond energy increase.
b.
both bond length and bond energy decrease.
c.
bond length increases and bond energy is unchanged.
d.
bond length is unchanged and bond energy increases.
e.
bond length decreases and bond energy increases.
 



 
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