wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Chem Unit 3 Study Guide

Total questions: 115

Worksheet time: 3hrs 2mins

Name
Class
Date
1.

The three subatomic particles are

a)

proton, neutron, electron

b)

proton, nucleus, electron

c)

protein, neutron, electricity

d)

proton, neutral, electives

2.

99.9% of the atom's mass is found where?

a)

nucleus

b)

protons

c)

electron cloud

d)

neutrons

3.

Electrons are

a)

negative

b)

positive

c)

neutral

4.

Protons are

a)

negative

b)

positive

c)

neutral

5.

When an atom contains more electrons than protons, it is

a)

a neutral atom with no charge

b)

an ion and negatively charged

c)

an ion and positively charged

d)

an isotope and has more mass

6.

When an atom contains more neutrons than another atom, it is

a)

a neutral atom with no charge

b)

an ion and negatively charged

c)

an ion and positively charged

d)

an isotope and has more mass

7.

The nucleus is ____________ charged.

a)

positively

b)

negatively

c)

neutral

8.

The area around the nucleus of an atom where the atom's electrons are most likely to be found is called

a)

electron cloud

b)

quark

c)

electron

d)

nucleus

9.

If a carbon atom has six protons and has a mass of 13 amu, how many neutrons are in that carbon atom?

a)

5

b)

6

c)

7

d)

8

10.

If a neutral atom has 8 protons, how many electrons does it have?

a)

7

b)

8

c)

9

d)

10

11.

Atoms of the same element with different numbers of neutrons are called

a)

metalloids

b)

transition elements

c)

radioactive

d)

isotopes

12.

A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number?

a)

26

b)

30

c)

52

d)

56

13.

What is 'E' pointing to?

a)

electron cloud

b)

electron

c)

nucleus

d)

proton

e)

neutron

14.

Where are electrons found?

a)

Outside the nucleus

b)

Under my bed

c)

Inside the nucleus

d)

Inside a proton

15.

Identify the atom in the image.

a)

hydrogen

b)

oxygen

c)

helium

d)

carbon

16.

Oxygen's atomic number is 8. This means that an oxygen atom has

a)

eight protons in the nucleus

b)

a total of eight protons and neutrons

c)

eight neutrons in its nucleus

d)

a total of eight neutrons and electrons

17.

What must change in an atom for it to become a new element?

a)

number of protons

b)

number of neutrons

c)

number of electrons

d)

none of the above

18.

The word ‘ atom’ comes from the Greek and means?

a)

invisible

b)

indivisible

c)

small

d)

abundant

19.

Which of the following statements best describe a matter?

a)

Matter is anything that occupy space but did not have mass.

b)

Matter is anything made up by small and discrete particles, which has mass and occupy space.

c)

Matter is anything that occupy space and has mass, which made up by tiny and discrete particles.

d)

Matter is anything that made up by tiny particles.

20.

Diagram above are the representation for solid, liquid and gas. Identify X, Y and Z.

a)

X = solid

Y = liquid

Z = gas

b)

X = liquid

Y = solid

Z = gas

c)

X = gas

Y = liquid

Z = solid

d)

X = solid

Y = gas

Z = liquid

21.
Who discovered that the nucleus contains positively charged particles called protons?
a)
Ernest Rutherford
b)
James Chadwick
c)
Democritus
d)
Niels Bohr
22.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
23.
 What is the mass number of this element?
a)
5
b)
27
c)
32
d)
59
24.
Which element has 31 protons ?
a)
Gallium 
b)
Germanium
c)
Gadolinium
d)
Polonium
25.

10.In an atom, electrons move in definite orbits around the nucleus.

a)

dalton

b)

neil bohr

c)

thompson

d)

rutherford

26.

Using the periodic table, label the correct element symbol next to the name.

a)

N

b)

O

c)

Fe

d)

Hg

e)

K

f)

Na

1
2
3
4
5
6
1)
2)
3)
4)
5)
6)
27.

Atoms consist of negatively charged (a)   that orbit the (b)   . The nucleus consists of positively charged (c)   and neutral (d)   . Protons and neutrons are each made from three (e)   .

Choose from the below words

electrons

nucleus

protons

neutrons

quarks

28.

Match the Following

a)

Element

1.

A substance that cannot be broken down into simpler substances by chemical means.

b)

Atom

2.

The smallest unit of an element that keeps the element’s chemical properties.

c)

Nucleus

3.

The dense center of an atom containing protons and neutrons.

d)

Proton

4.

Positively charged particles found in the nucleus of an atom.

e)

Neutron

5.

Particles with a neutral charge found in the nucleus of an atom.

29.
Question Image

Match the following letters with their correct representation in atomic structure.

a)

B

1.

Letter representing a proton

b)

A

2.

Letter representing a neutron

c)

C

3.

Letter representing an electron

d)

D

4.

Letter representing the nucleus

30.

What is the charge of a proton?

a)

Negative

b)

Positive

c)

Neutral

d)

Variable

31.

Which subatomic particle is not found in the nucleus of an atom?

a)

Proton

b)

Neutron

c)

Electron

d)

All of the above are found in the nucleus

32.

What does the atomic number of an element represent?

a)

The number of protons in the nucleus

b)

The number of neutrons in the nucleus

c)

The total number of protons and neutrons in the nucleus

d)

The total number of protons and electrons in an atom

33.

How many electrons are present in this Carbon atom?

a)

4

b)

5

c)

6

d)

7

34.

How many neutrons are in an atom of carbon-14?

a)

6

b)

8

c)

10

d)

14

35.

How many protons does this isotope of titanium have?

a)

22

b)

26

c)

48

d)

70

36.

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

a)

2

b)

34

c)

36

d)

40

37.

Write the hyphen notation for the isotope that has 39 protons and 50 neutrons.

a)

Yttrium-11

b)

Tin-39

c)

Tin-89

d)

Yttrium-89

38.
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
39.

Chromium has four naturally occurring isotopes (chromium-50, chromium-52, chromium-53, and chromium-54). What is the average atomic mass of Chromium?

a)

4

b)

51.996

c)

52.25

d)

Not enough information was given.

40.

An element has three isotopes. Given the abundances and relative masses, calculate the average atomic mass and determine (from the periodic table) which element it is.


Abundances | Relative masses

0.005% | 234.04 amu

0.720% | 235.04 amu

99.275% | 238.05 amu

a)

Uranium (#92, Atomic Mass: 238.03 amu)

b)

Fluorine (#9, Atomic Mass: 19.00 amu)

c)

Mercury (#89, Atomic Mass: 200.59 amu)

d)

Polonium (#84 209 amu)

41.
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
42.

Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118 amu) and 87Rb (relative mass 86.9092 amu). The abundance of 87Rb is 27.8%, If rubidium has an average atomic mass of 85.47 amu, what is the % abundance of 85Rb (in percent)?

a)

27.9%

b)

72.1%

c)

74.63%

d)

34.29%

43.
What is the name of the pictured isotope?
a)
Carbon-12
b)
Carbon-13
c)
Carbon-14
d)
Carbon-15
44.

This isotope has:

​ (a)   protons

8 electrons

​ (b)   neutrons

mass number of ​ (c)  

Choose from the below words
8
11
19
20
10
18
9
45.

An isotope is an atom of the ​ (a)   element but with a different number of ​ (b)   . This difference causes the ​ (c)   of the atom to change.

Choose from the below words
same
neutrons
mass
different
protons
electrons
charge
atomic number
46.

Organize these options into the right categories

Categorize the following

carbon-14

lithium-7

phosphorus-30

Hyphen Notation
Isotope Notation
47.

Match the following

a)

the mass of the atom is found here

1.

nucleus

b)

these are in the nucleus

2.

protons & neutrons

c)

if you change the number of protons you get a different...

3.

element

d)

if you change the number of neutrons you get a different...

4.

mass

e)

an isotope has the same number of protons but a different number of...

5.

neutrons

48.

Label the picture

a)

mass number

b)

atomic number

c)7
d)15
e)charge
1
2
3
1)
2)
3)
49.

Label the isotope symbol for Calcium-41.

a)

19

b)

41

c)

22

d)

20

e)

40

f)

21

g)

39

1
2
3
1)
2)
3)
50.

Label the mass number:

A
B
C
51.

Label the atomic number:

A
B
C
52.

Label the number of protons:

A
B
C
53.

Label the number that is protons and neutrons added together:

A
B
C
54.

Write the hyphen notation for the element that has 9 protons and 10 neutrons:

(a)  

55.

Write the hyphen notation for the element that has 1 proton and 0 neutrons:

(a)  

56.

An atom of Aluminum-27 has:

​ (a)   protons

​ (b)   neutrons

a mass number of ​ (c)  

Choose from the below words
13
14
27
15
12
28
26
57.
Question Image

Match the following

a)

number of protons

1.

18

b)

number of neutrons

2.

22

c)

mass number

3.

40

58.

What is the mass number of an atom that has 52 protons, 52 electrons, and 76 neutrons?

(a)  

59.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
60.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
61.
How many neutrons in C-14?
a)
6
b)
7
c)
14
d)
8
62.
How many neutrons does the isotope below have?     89 36Kr
a)
53
b)
36
c)
89
d)
125
63.
How many neutrons does an atom of the isotope Neon-22 have?
a)
12
b)
10
c)
22
d)
20
64.

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

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

65.

Potassium-39 has how many neutrons?

a)

19

b)

18

c)

20

d)

21

66.

Nickel-59 has how many neutrons?

a)

30

b)

31

c)

32

d)

33

67.

Bromine-80 has how many neutrons?

a)

41

b)

42

c)

44

d)

45

68.

12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

69.

What is a positive ion called?

a)

anion

b)

cation

c)

isotope

d)

covalent

70.

What is a negative ion called?

a)

anion

b)

cation

c)

covalent

d)

isotope

71.

Which types of elements from cations?

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

72.

Which types of elements from anions?

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

73.

Why do elements form bonds?

a)

to get a charge

b)

so they can make friends

c)

to become stable by getting a full valence shell

d)

to become stable by increasing their mass

74.

How many electrons would a Nitrogen ion gain/lose?

a)

lose 5

b)

gain 5

c)

lose 3

d)

gain 3

75.

How many electrons would a Calcium ion gain/lose?

a)

lose 1

b)

gain 1

c)

lose 2

d)

gain 2

76.

What is the ion formed from Sulfur?

a)

S+2

b)

S-2

c)

S+6

d)

S-6

77.

If an atom loses electrons, the charge will be positive.

a)

true

b)

false

78.

A Bromine ion gains 1 electron, which of the following is the correct symbol for a Bromine ion?

a)

Br-1

b)

Br+1

c)

Br+7

d)

Br-7

79.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
80.
An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.
a)
51.99 amu
b)
52.19 amu
c)
53.45 amu
d)
17.33 amu
81.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)
41.97 amu
b)
42.19 amu
c)
10.43 amu
d)
40.04 amu
82.
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
83.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?
a)
32
b)
33
c)
34
d)
no way to know
84.

Calculate the average atomic mass of this element.

a)
106.38649amu
b)
111.91896amu
c)
107.8677amu
d)
121
85.

Compute the average atomic mass for this element.

a)
27.977
b)
28.09
c)
28.976
d)
The average mass cannot be determined from provided information.
86.

Calculate the average atomic mass of the element using the following data:

[Isotope / % abundance]

[X- 54 / 6% ] [X- 56 / 92% ] [ X-57 / 2% ]

a)

53.7 amu

b)

54.9 amu

c)

5592.0 amu

d)

55.9 amu

87.

An element exists as the three isotopes shown. What is the average atomic mass?

a)

20.74 amu

b)

22.56 amu

c)

18.39 amu

d)

24.31

88.
An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to
a)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
89.
What is the name of the atom pictured here?
a)
Nitrogen
b)
Nitrogen-15
c)
Nitrogen-7
d)
Nitrogen-8
90.
Which of the following could have 82 neutrons?
a)
W-182
b)
Ta-181
c)
Cs-132
d)
Ba-138
91.
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
92.

All of the following are found in the nucleus EXCEPT

a)

Proton

b)

Neutron

c)

Electron

d)

There are no exceptions. All are found in the nucleus

93.

What is the identity of the atom?

a)

Aluminum

b)

Silicon

c)

Cobalt

d)

Zirconium

94.

Which is the best nuclear symbol for a potassium atom with 21 neutrons?

a)
b)
c)
d)
95.

Which of the following is the nuclear symbol for lithium-6

a)
b)
c)
d)
96.

The correct hyphen notation for the nuclear symbol given is

a)

chromium - 24

b)

chromium - 50

c)

chromium - 74

d)

chromium - 26

97.

The hyphen notation of an atom of calcium with 20 protons, 20 electrons, and 22 neutrons is

a)

calcium - 20

b)

calcium - 40

c)

calcium - 62

d)

calcium - 42

98.

The number 84 in strontium - 84 represents

a)

the atomic number

b)

the mass number

c)

the average atomic mass

d)

the number of electrons

99.

Which scientist discovered the electrons?

a)

Dalton

b)

Thomson

c)

Atristotle

d)

Bohr

100.

Bohr discovered that electrons are located in

a)

the nucleus

b)

inside protons

c)

electron cloud

d)

circular orbits around the nucleus

101.
In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.
a)
Atoms
b)
Parts
c)
Molecules
d)
Hydrogen
102.

Who was the Greek philosopher who called the smallest particle of matter an "atom"?

a)

Democritus

b)

Aristotle

c)

J.J Thompson

d)

Einstein

103.

Which of the following is/are conclusions based on Rutherford’s gold foil experiment?

a)

Atom is mostly empty space

b)

The nucleus is positively charged

c)

The atom has a small dense nucleus

d)

All answers are correct

104.
Who is the scientist who proposed the "solar system" model of an atom where the electrons orbit around the nucleus?
a)
Democritus
b)
Niels Bohr
c)
Ernest Rutherford
d)
Chadwick
105.
Rutherford's gold foil experiment provided evidence that...
a)
negative and positive charges are spread evenly throughout the atom.
b)
alpha particles have a positive charge.
c)
gold is not a dense as previously thought.
d)
there is a dense positively charged nucleus at the center of an atom.
106.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
107.
Which of the following is NOT a part of Dalton's atomic theory?
a)
All elements are composed of atoms.
b)
Atoms are alwyas in motion.
c)
Atoms of the same element are always identical.
d)
Atoms that combine do so in simple, whole-number ratios.
108.
What did James Chadwick discover?
a)
neutrons
b)
electrons
c)
the atomic theory
d)
protons
109.

Which scientist theorized that you cannot know an electron's position and momentum at the same time?

a)

Bohr

b)

Schrödinger

c)

Heisenburg

d)

J J Thomson

110.
Which model suggested that: Atoms mostly consist of positively charged material with negatively charged particles (electrons) located throughout the positive material.
a)
Bohrs Model
b)
Plum Pudding Model 
c)
Democritus Model
d)
Our current model 
111.
Who proposed that the atom consists mostly of empty space?
a)
Bohr
b)
Dalton
c)
Rutherford
d)
Chadwick
112.

What were John Dalton three contributions to atomic history?

a)

Created the atomic theory

b)

Discovered that the atom is mostly empty space

c)

Believed that atoms of a given element are identical

d)

Hypothesized that the atom is a tiny, hard sphere

e)

Believed that the universe was made of tiny "uncuttable" particles

113.

What were Ernest Rutherford's three contributions to atomic theory?

a)

Discovered that the atom is mostly empty space

b)

Discovered the nucleus- did the gold foil experiment

c)

Used the cathode ray tube in his discovery

d)

Discovered the electron

e)

Discovered that the proton had a positive charge

114.

What were J. J. Thomson's three contributions to the atomic theory?

a)

Discovered the electron

b)

Discovered the nucleus -did the gold foil experiment

c)

Used the cathode ray tube in his discovery

d)

Created a model of the atom with electrons moving around the nucleus in fixed orbits

e)

Created the "plum pudding" model of the atom

115.

What's the difference between these two atomic models?

a)

The Bohr model has specific paths for the electrons, whereas the Rutherford model just has electrons wherever

b)

The Bohr model has a nucleus and the Rutherford model doesn't

c)

The Rutherford model has electrons because Rutherford discovered the electron

d)

Rutherford's model is slightly smaller because Bohr felt like he deserved it

Similar Resources on Wayground

Significant Figures

111 questions

Significant Figures

quiz

Worksheet

•

11th Grade

Second Semester Exam Review

120 questions

Second Semester Exam Review

quiz

Worksheet

•

10th Grade - University

Chemistry S2 Practice Test

110 questions

Chemistry S2 Practice Test

quiz

Worksheet

•

11th Grade

Final exam first semester

111 questions

Final exam first semester

quiz

Worksheet

•

9th - 12th Grade

Chemistry Final Review

120 questions

Chemistry Final Review

quiz

Worksheet

•

9th - 12th Grade

HC07 Types of Reactions

118 questions

HC07 Types of Reactions

quiz

Worksheet

•

9th - 12th Grade

1st Semester Review

110 questions

1st Semester Review

quiz

Worksheet

•

KG - University

Unit 3 Review- The PT & Ions

120 questions

Unit 3 Review- The PT & Ions

quiz

Worksheet

•

10th - 12th Grade