Exam
Name___________________________________
 
MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 
1) 

There are __________ paired and __________ unpaired electrons in the Lewis symbol for a phosphorus atom. 

1) 

_______ 
A) 

2, 4 

B) 

2, 3 

C) 

4, 3 

D) 

4, 2 

E) 

0, 3 

 
2) 

Based on the octet rule, magnesium most likely forms a __________ ion. 

2) 

_______ 
A) 

B) 

C) 

D) 

E) 

 
3) 

For a given arrangement of ions, the lattice energy increases as ionic radius __________ and as ionic charge __________. 

3) 

_______ 
A) 

increases, decreases 
B) 

decreases, increases 
C) 

increases, increases 
D) 

decreases, decreases 
E) 

This cannot be predicted. 

 
4) 

The electron configuration of the  ion is __________. 

4) 

_______ 
A) 

[Ne]33 
B) 

[Kr]32 
C) 

[Ar]33 
D) 

[Ar]33 
E) 

[Ne]33 

 
5) 

Elements from opposite sides of the periodic table tend to form __________. 

5) 

_______ 
A) 

homonuclear diatomic compounds 
B) 

covalent compounds that are gaseous at room temperature 
C) 

covalent compounds 
D) 

compounds that are gaseous at room temperature 
E) 

ionic compounds 

 
6) 

What is the maximum number of double bonds that a hydrogen atom can form? 

6) 

_______ 
A) 

0 

B) 

1 

C) 

2 

D) 

3 

E) 

4 

 
7) 

In the molecule below, which atom has the largest partial negative charge __________?

		Cl
		 ∣
	F C Br
		 ∣
		 I

7) 

_______ 
A) 

Br 

B) 

I 

C) 

C 

D) 

F 

E) 

Cl 

 
8) 

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group. 

8) 

_______ 
A) 

decreases, increases 
B) 

increases, stays the same 
C) 

stays the same, increases 
D) 

increases, increases 
E) 

increases, decreases 

 
9) 

The Lewis structure of P shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs. 

9) 

_______ 
A) 

2, 2 

B) 

1, 3 

C) 

1, 2 

D) 

3, 3 

E) 

3, 1 

 
10) 

The formal charge on sulfur in S is __________, where the Lewis structure of the ion is: 

10) 

______ 
A) 

0 

B) 

+2 

C) 

+4 

D) 

-4 

E) 

-2 

 
11) 

Using the table of average bond energies below, the △H for the reaction is __________ kJ.

	C≡O (g)  +  2 (g)  →  C-O-H (g) 
	Bond: 	C-O	C=O	C≡O	C-H	H-H	O-H
	D (kJ/mol):	 358	799	1072	413	436	463

11) 

______ 
A) 

+276 

B) 

-116 

C) 

-735 

D) 

-276 

E) 

+735 

 
12) 

For a molecule with the formula A the molecular shape is __________. 

12) 

______ 
A) 

trigonal planar 
B) 

linear or trigonal planar 
C) 

T-shaped 
D) 

linear or bent 
E) 

linear or T-shaped 

 
13) 

The molecular geometry of the  ion is __________. 

13) 

______ 
A) 

trigonal pyramidal 
B) 

linear 
C) 

octahedral 
D) 

tetrahedral 
E) 

bent 

 
14) 

The O-S-O bond angle in S is slightly less than __________. 

14) 

______ 
A) 

120° 

B) 

90° 

C) 

60° 

D) 

109.5° 

E) 

180° 

 
15) 

The hybridization of orbitals on the central atom in a molecule is sp. The electron-domain geometry around this central atom is __________. 

15) 

______ 
A) 

trigonal bipyramidal 
B) 

octahedral 
C) 

tetrahedral 
D) 

linear 
E) 

trigonal planar 

 
16) 

The hybridization of the central atom in the Xe molecule is __________. 

16) 

______ 
A) 

d 

B) 

C) 

D) 

sp 

E) 

 
17) 

There is/are __________ π bond(s) in the molecule below. 

17) 

______ 
A) 

2 

B) 

0 

C) 

6 

D) 

7 

E) 

1 

 
18) 

Using the VSEPR model, the electron-domain geometry of the central atom in  ClF3 is __________. 

18) 

______ 
A) 

trigonal planar 
B) 

trigonal bipyramidal 
C) 

octahedral 
D) 

linear 
E) 

tetrahedral 

 
19) 

Using the VSEPR model, the molecular geometry of the central atom in  NCl3 is __________. 

19) 

______ 
A) 

linear 
B) 

trigonal planar 
C) 

bent 
D) 

trigonal pyramidal 
E) 

tetrahedral 

 
20) 

The hybrid orbital set used by the central atom in  KrF2 is __________. 

20) 

______ 
A) 

B) 

C) 

D) 

d 

E) 

sp 

 
1) 

B 

2) 

E 

3) 

B 

4) 

E 

5) 

E 

6) 

A 

7) 

D 

8) 

E 

9) 

B 

10) 

A 

11) 

B 

12) 

D 

13) 

A 

14) 

A 

15) 

D 

16) 

C 

17) 

E 

18) 

B 

19) 

D 

20) 

D