Bonding: General Concepts - Chemistry Worksheet (Answers)

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Chem 121
Sp 2014
CHEM 121
Chapter 8 Bonding: General Concepts
KEY
1. How many unpaired electrons are in the Lewis electron-dot symbol for an oxygen atom?
2
0
4
1
2. Which of the following shows the incorrect number of valence electrons in parentheses?
Ca (2)
Se (4)
As (5)
Li (1)
Cl (7)
3. Which of the following exhibits metallic bonding?
PCl
MgCl
O
Au-Pd alloy
NH
3
2
3
3
2-
+
3-
3+
2+
4. Which of the following ions does not have a noble-gas configuration?
S
Y
P
Sc
Mg
5. Which of the following is most likely possible for an alkaline earth metal?
6. What is main energy level from which electrons are lost when tungsten forms a cation?
5
3
2
1
6
4
7. Which of the following processes would be expected to be exothermic?
+
-
K
+ Br
KBr
(g)
(g)
(s)
Br
→ 2 Br
2 (g)
(g)
K
K
(s)
(g)
+
-
K
K
+ e
(g)
(g)
Br
Br
2 (l)
2 (g)
8. In which of the following sets are all of the ions or atoms isoelectronic with each other?
+
+
2+
+
2+
2-
2-
2+
3+
3-
2-
-
(i) K
, Na
, Mg
(ii) Ag
, Cd
(iii) Se
, Te
, Kr
(iv) Ru
, Rh
(v) As
, Se
, Br
A) v
B) i
C) ii, iv, and v
D) iii
E) iv
F) ii
9. In which of the following sets are all of the ions or atoms isoelectronic with one another?
+
3+
4+
2+
+1
2-
-
-
+
(i) Ba, Lu
, Hf
(ii) Nb
, Y
, Rb
(iii) Te
, I
, Xe
(iv) Br
, Kr, Rb
A) ii only
B) iii and iv only
C) i only
D) iv only
E) i and ii only
F) iii only
+
-
10. Which of the following has the greatest diameter?
Na
Na
Na
-
11. The anion ICl
has how many total valence electrons?
28
34
35
8
36
4
12. Which of the following bonds is polar?
S-S
F-F
O-O
O-S
-
3-
+
-
2+
13. Which ion below has a noble-gas electron configuration?
Cl
S
I
K
O
3+
2-
2+
3+
2+
14. Which one of the following ions has a noble-gas electron configuration?
Fe
Se
Cu
Cr
Zn
15. Which ionic compound is not expected to form from a combination of the following pairs of elements?
SrO
Ca
N
GaS
Li
S
MgS
3
2
2
16. Which ionic compound is not expected to form from a combination of the following pairs of elements?
K
N
RbCl
CsO
AlN
B
O
3
2
3
2+
2-
-
6+
6-
17. Based upon electron configuration, which ion would magnesium most likely form?
Mg
Mg
Mg
Mg
Mg
2-
2
6
2
2
2
6
2
10
2
18. Which of the following is the electron configuration for the S
ion?
[Ar]3s
3p
[Ne]3s
3p
[Ne]3s
3p
[Ar]4s
3d
4p
19. Which of the following is correctly arranged with respect to the size of the atom/ion?
+
-
+
+
+
2+
3+
(i) Br
> Br > Br
(ii) Rb
> K
> Na
(iii) Ru > Ru
> Ru
A) i
B) i and ii
C) ii
D) iii
E) ii and iii
F) i and iii
2-
+
-
2-
20. For the following set of atoms and ions, arrange the members in order of decreasing size:
Te
, Br, Rb
, Br
, Se
2-
2-
-
+
2-
2-
-
+
2-
-
2-
+
Te
> Se
> Br
> Br > Rb
Te
> Se
> Br > Br
> Rb
Te
> Br
> Se
> Br > Rb
2-
2-
-
+
2-
2-
-
+
Se
> Te
> Br
> Br > Rb
Te
> Se
> Br
> Rb
> Br

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