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Unit 1 Practice Test

Total questions: 87

Worksheet time: 4hrs 54mins

Name
Class
Date
1.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
2.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
3.

Which image could be a representation of NH3?

a)

A

b)

B

c)

C

4.

Which is the correct molecular structure for carbon dioxide?

a)
b)
c)
d)
5.
Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?
a)
A
b)
B
c)
C
d)
D
6.
Three pairs of electrons are shared in a
a)
Single bond
b)
Double bond
c)
Triple bond
7.

What is the correct structure for BF3?

a)

Option A.

b)

Option B.

c)

Option C.

d)

Option D.

8.

CCl4 has how many double bonds?

a)

0

b)

1

c)

2

d)

3

9.

In HCN (Carbon is usually the central atom) what kind of bond is between the C and N

a)

Single

b)

Double

c)

Triple

10.
How many electrons can be used in the Lewis Structure for : NO3 -
a)
23
b)
20
c)
18
d)
24
11.
How many electrons does each line indicate are shared?
a)
1
b)
2
c)
3
d)
4
12.

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.

13.
What molecule could this be? 
a)
BF3
b)
CH4
c)
H2O
d)
CO2
14.
Determine the type of bond in a nitrogen molecule (N2). HINT: Use (IE - AE)/2 = # of bonds.
a)
Double covalent
b)
Single covalent
c)
Ionic
d)
Triple covalent
15.

Which of the following is a valid Lewis structure for hydrogen cyanide, HCN?

a)
b)
c)
d)
16.

Which Lewis Dot Model drawing correctly shows an O2 molecule?

a)
b)
c)
d)
17.
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
18.

This atom has an atomic number of ​ (a)   .

This atom has a mass number of ​ (b)   .

This atom has an atomic mass of ​ (c)   .

This atom has ​ (d)   valence electrons.

Choose from the below words
8
16
15.999
6
24
2
12
10
3
19.

Match the following

a)

1.

potassium

b)

2.

lithium

c)

3.

magnesium

d)

4.

titanium

e)

5.

sodium

20.

Which side of the periodic table are the metals located?

A
B
21.

Which group is the Alkali Metals?

A
B
C
D
22.

Which group is the Halogens?

A
B
C
D
23.

Why are ions formed?

a)

To make our lives difficult

b)

Because atoms want to be stable

c)

Because atoms have the same number of protons and electrons

d)

Because atoms gained neutrons

24.

Which particles change the charge in atoms when ions are formed?

a)

Protons

b)

Electrons

c)

Neutrons

25.

Ionic bonds form between two ions that have

a)

negative charges

b)

positive charges

c)

opposite charges

26.

Cations are...

a)

Positive

b)

Negative

c)

Neutral

27.

Anions are...

a)

Positive

b)

Negative

c)

Neutral

28.

An atom becomes _________ when it gains electrons.

a)

Positive

b)

Negative

c)

Neutral

29.

An atom becomes _______ when it loses electrons.

a)

Positive

b)

Negative

c)

Neutral

30.
Cations are _______ that form ____________ ions and __________ electrons.
a)
nonmetals, positive, lose
b)
nonmetals, negative, gain
c)
metals, positive, gain
d)
metals, positive, lose
31.
Anions are _______ that form ____________ ions and __________ electrons.
a)
nonmetals, positive, lose
b)
nonmetals, negative, gain
c)
metals, positive, gain
d)
metals, positive, lose
32.

When an atom loses a valence electron, it becomes a(n) _____________ ion.

a)

positive

b)

negative

c)

neutral

33.

When an atom gains a valence electron, it becomes a(n) _____________ ion.

a)

positive

b)

negative

c)

neutral

34.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
35.
What is the charge of an atom that has gained one electron?
a)
-1
b)
-2
c)
+1
d)
+2
36.

Cations are

a)

negative ions

b)

neutral electrons

c)

positive ions

37.

Anions are

a)

Negative ions

b)

Neutral ions

c)

Positive ions

38.

Nonmetals are

a)

usually cations

b)

usually anions

39.

Metals are:

a)

Usually cations

b)

Usually anions

40.

Cations are _________________ and anions are _______________

a)

metals, nonmetals

b)

nonmetals, metals

41.

Isotopes of an element have a different number of...

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

42.

Potassium-39 has how many neutrons?

a)

19

b)

18

c)

20

d)

21

43.

Nickel-59 has how many neutrons?

a)

30

b)

31

c)

32

d)

33

44.

Bromine-80 has how many neutrons?

a)

41

b)

42

c)

44

d)

45

45.

76 protons and 114 neutrons

a)

Osmium-114

b)

Osmium-76

c)

Osmium-190

d)

Osmium-190.23

46.

12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

47.

9 protons and 9 neutrons

a)

Fluorine-18

b)

Fluorine-9

c)

Fluorine-16

d)

Fluorine-18.998

48.

How do you calculate mass number?

a)

Mass x percent

b)

Protons + Electrons

c)

Protons + Neutrons

d)

Neutrons + Protons + Electrons

49.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

50.

What is the atomic number of Barium, Ba? (enlarge the periodic table)

a)

20

b)

38

c)

56

d)

88

51.

How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)

a)

Sodium has 1 proton.

b)

Sodium has 3 protons.

c)

Sodium has 11 protons

52.

Atoms of the same element which have a different number of neutrons are called _________________.

a)

ions

b)

isotopes

c)

quarks

d)

molecules

53.

Which subatomic particle has a negative charge in the atom?

a)

proton

b)

neutron

c)

electron

d)

quark

54.

How many neutrons does C-14 contain? (tap to enlarge the image)

a)

6

b)

7

c)

14

d)

8

55.

ALL atoms of the same element have:

a)

same number of proton

b)

same number of nucleon

c)

different number of neutron

d)

different number of electron

56.
If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?     I. 7735X  II. 7733X  III. 8137X  IV. 8135 X
a)
I and II
b)
III and IV
c)
I and IV
d)
I and III
57.
How many neutrons does the isotope below have?     89 36Kr
a)
53
b)
36
c)
89
d)
125
58.
Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.
a)
204
b)
206
c)
207
d)
208
59.
Which subatomic particles contribute the most to the mass of an atom?
a)
Protons, Neutrons, Electrons
b)
Protons only
c)
Protons and Electrons
d)
Protons and Neutrons
60.
The number of protons is equal to 
a)
the atomic number
b)
the number of neutrons
c)
the energy levels
d)
the periodic table groups
61.

If an atom has 12 neutrons and 11 protons, what is its atomic mass?

(a)  

62.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
63.
Calculate the average atomic mass of silver.
a)
106.38649amu
b)
111.91896amu
c)
107.8677amu
d)
121
64.
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
a)
9.012, Beryllium
b)
12.011, Carbon
c)
6.941, Lithium
d)
10.812, Boron
65.
Oxygen has 8 protons. What is oxygen's atomic number?
a)
16
b)
8
c)
15.999
d)
0
66.

What is the charge on a lithium atom that loses 1 electron?

a)

+1

b)

0

c)

-1

d)

-2

67.

What is the atomic number of Fe? (click to see image)

a)

26

b)

55.845

c)

56

d)

30

68.
a)
2
b)
8
c)
3
d)
13
69.
a)
12
b)
7
c)
8
d)
14
70.

Valence electrons are in the...

a)

Innermost energy level of the atom.

b)

Middle energy level of the atom.

c)

Outermost energy level of the atom.

d)

energy levels of the atom.

71.

How many valence electrons does Helium have?

a)

1

b)

2

c)

3

d)

4

e)

5

72.

What is wrong with this Bohr Model?

a)

Nothing. It's fine.

b)

It has the wrong number of total electrons.

c)

It has the wrong number of electrons on the first energy level.

d)

It has the wrong number of electrons on the second energy level.

73.

What element is this?

a)

Boron

b)

Lithium

c)

Oxygen

d)

Sulfur

74.

What does the blue circle represent?

a)

proton

b)

neutron

c)

electron

75.

What's wrong with this Bohr model?

a)

Nothing. It's fine.

b)

Wrong number of total electrons

c)

Wrong number of electrons on the first energy level

d)

Wrong number of electrons on the second energy level

76.

How many energy levels does this atom have?

a)

1

b)

2

c)

3

d)

4

77.

How many energy levels does this Bohr Diagram have?

a)

1

b)

2

c)

3

d)

4

78.

How many valence electrons does this Bohr Diagram have?

a)

2

b)

7

c)

3

d)

17

79.

There are several elements that this could be. One of them is listed below. Pick it!

a)

Mg

b)

O

c)

F

d)

Be

80.

This Bohr Model has been made incorrectly. Redraw it, showing the seven electron placed correctly. How many valence electrons will it have when drawn right?

a)

5

b)

7

c)

2

d)

1

81.

What element is this?

a)

O

b)

Cl

c)

Na

d)

There's a number of elements it could be!

82.

How many energy levels does this element have?

a)

Unknown - it represents any element with seven valence electrons.

b)

1

c)

2

d)

3

83.

What ion will this form?

a)

3+

b)

3-

c)

5+

d)

5-

84.

What ion will this form?

a)

1-

b)

1+

c)

7+

d)

7-

85.

What ion will this form?

a)

1+

b)

1-

c)

7+

d)

7-

86.

What ion will K form?

a)

1+

b)

2+

c)

1-

d)

2-

87.

What ion will a atom with 5 valence electrons form?

a)

3+

b)

3-

c)

5+

d)

5-

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