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Lewis Structure

Total questions: 24

Worksheet time: 5hrs 48mins

Name
Class
Date
1.
This is a correct dot diagram for oxygen (O)
a)
true
b)
false
2.

This is a correct Lewis dot diagram for fluorine (F)

a)
true
b)
false
3.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
4.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
5.
When writing Lewis Structures, only __________ electrons are used.
a)
Inner shell
b)
Core 
c)
Valence
d)
Stable
6.

In water molecule structure (H2O) how many eletrons are unpaired?

a)

2

b)

none

c)

4

d)

6

7.

Which is the correct molecular structure for carbon dioxide (CO2)?

a)

b)

c)

d)

8.
In the correct Lewis structure for CH4, how many unshared electron pairs surround the carbon?
a)
2
b)
8
c)
0
d)
4
9.
Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?
a)
A
b)
B
c)
C
d)
D
10.

Each line (bond) in a Lewis Structure represents __________ electron(s).

a)
3
b)
2
c)
1
d)
4
11.
Which of the following is the correct Lewis structure for the compound PBr3?
a)
structure A
b)
structure B
c)
structure C
d)
structure D
12.

3. Which is a correct Lewis structure for hydrogen cyanide, HCN?

a)
b)
c)
d)
13.

 5. How many valence electrons are in total in the following formula: PCl4 ?

a)

12

b)

33

c)

23

d)

5

14.
Three pairs of electrons are shared in a
a)
Single bond
b)
Double bond
c)
Triple bond
15.
Atoms of H only form _________ bonds.
a)
Double
b)
Single
c)
Multiple
d)
Triple
16.

What is the central atom in this molecule: NO3

a)

3

b)

O

c)

N

d)

none

17.

How would you draw a Lewis dot diagram for Magnesium?

a)
b)
c)
d)
18.
What is the correct formula for this molecule?
a)
Si4F
b)
SiF4
c)
SiF
d)
Si4F4
19.

Why is this Lewis Structure incorrect? Choose all that apply.

a)

There are too many bonds around Si.

b)

There should only be single bonds in this Lewis Structure.

c)

The Structure is missing a triple bond.

d)

Chlorine only has 6 electrons surrounding it.

20.

How many valence electrons does Caesium have?

a)

1

b)

4

c)

7

d)

8

21.

How many valence electrons does Barium Have

a)

8

b)

4

c)

1

d)

2

22.

How many valence electrons does Thallium Have?

a)

3

b)

6

c)

1

d)

5

23.

How many valence electrons does Xenon Have?

a)

1

b)

2

c)

7

d)

8

24.

How many valence electrons does Iodine Have?

a)

1

b)

2

c)

7

d)

8

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