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Matter & Atomic Structure Practice Test

Total questions: 99

Worksheet time: 3hrs 30mins

Name
Class
Date
1.

What causes an atom to be radioactive?

a)

It has too many protons only

b)

It has too many or too few neutrons

c)

  1. It has the wrong number of electrons

d)

It has lost all its energy

2.

Which statement about radioactive isotopes is true?

a)

All isotopes are radioactive

b)

Radioactive isotopes have unstable nuclei

c)

Radioactive isotopes have equal numbers of protons and neutrons

d)

Radioactive isotopes never occur naturally

3.

If boron has two isotopes, boron-10 and boron-11, which do you think is more abundant?

a)

boron-10

b)

boron-11

4.

A student creates a hypothesis about their upcoming experiment. What must the student do in their experiment with relationship to their hypothesis?

a)

change the experiment to make the hypothesis correct

b)

create a law based on the hypothesis

c)

make observations to prove or disprove the hypothesis

d)

ignore the hypothesis

5.

Which of the following would NOT be used in the event a students clothing caught fire?

a)

Eyewash fountain

b)

Safety shower

c)

Fire blanket

d)

Fire extingisher

6.

A team of students uses a balance to find the mass of a large beaker. What is the mass of the beaker?

a)

53.6 g

b)

253.6 g

c)

536 g

d)

2536 g

7.

Which of the following is the best estimate of the volume poured from the graduated cylinder?

a)

3.00 mL

b)

3.60 mL

c)

4.40 mL

d)

4.60 mL

8.

Which of these is the correct isotopic notation for sodium-23?

a)

b)

c)

d)

9.

A group of students are comparing elements C and D found on the periodic table displayed. Which of the following statements accurately compare these two elements? Select TWO correct answers.

a)

Element D has more protons than element C.

b)

Element D has more valence electrons than element C.

c)

Element D has more energy levels than element C.

d)

Element C has more valence electrons than element D.

e)

Element C has more protons than element D.

10.

Use your periodic table and determine which of the following atoms is represented by the Bohr model.

a)

aluminum

b)

calcium

c)

iron

d)

sodium

11.

In the Bohr model of an atom (shown), protons are represented in blue, the neutrons are red and the electrons are green. Use your periodic table and determine which of the following atoms is represented by the Bohr model.

a)

magnesium

b)

calcium

c)

aluminum

d)

sodium

12.

Which of these has the most mass?

a)

b)

c)

d)

13.

A group of students was asked to generate statements about the structure of an atom. The students came up with the statements below. Which statements accurately describe the structure of atoms?

Select TWO correct answers.

a)

Valence electrons are the electrons located on the outermost energy level.

b)

Electrons are neutrally charged and located outside the nucleus.

c)

The nucleus of an atom contains positively charged protons and negatively charged electrons.

d)

Protons are positively charged and located outside the nucleus.

e)

The number of neutrons is equal to the mass number minus the number of protons.

14.

Atoms are made up of three subatomic particles: protons, neutrons, and electrons. A student is creating a list of statements about each of the subatomic particles found in an atom. Which of the following statements accurately describes protons?

Select TWO correct answers.

a)

Protons are located in the nucleus and have a negative charge.

b)

Protons are located in the nucleus and have a positive charge.

c)

Protons are located in the electron cloud and are neutrally charged.

d)

Protons are located in the nucleus and contribute to the mass of an atom.

e)

Protons are located in the nucleus and do not contribute to the mass of an atom.

15.

A student has a block of metal with a mass of 54 g and a volume of 18 cm³. What is the density of the block?

a)

0.33 g/cm³

b)

3.0 g/cm³

c)

36 g/cm³

d)

972 g/cm³

16.

A rectangular block of wood has a mass of 240 g. Its length is 10 cm, width is 4 cm, and height is 3 cm. What is the density of the block?

a)

2.0 g/cm³

b)

8.0 g/cm³

c)

20.0 g/cm³

d)

80.0 g/cm³

17.

The graph here shows the volume of a liquid as its mass increases. Based on the graph, what is the density of the liquid?

a)

0.25 g/mL

b)

0.50 g/mL

c)

1.0 g/mL

d)

2.0 g/mL

18.

Which of these represents a mixture of elements?

a)

b)

c)

d)

19.

Which of these represents a pure substance?

a)

b)

c)

d)

20.

Iron rusting is an example of a

a)

physical change

b)

chemical change

c)

physical property

d)

chemical property

21.

Which of the following correctly describes the arrangement of particles in the three main phases of matter?

a)

Solid – particles move freely with lots of space; Liquid – particles are fixed in place; Gas – particles slide past one another.

b)

Solid – particles are closely packed and vibrate in place; Liquid – particles are close but can move past each other; Gas – particles are far apart and move freely.

c)

Solid – particles are spread far apart and move rapidly; Liquid – particles are evenly spaced; Gas – particles are fixed in a rigid structure.

d)

Solid – particles are randomly scattered; Liquid – particles vibrate in fixed positions; Gas – particles are tightly packed.

22.

Which of the following is a pure substance?

a)

air

b)

salt water

c)

carbon dioxide (CO2)

d)

pizza

23.

Which of the following is an element, not a compound?

a)

Water (H₂O)

b)

Copper (Cu)

c)

Carbon dioxide (CO₂)

d)

Sodium chloride (NaCl)

24.

Which subatomic particle has a negative charge and is found outside the nucleus?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleon

25.

How many neutrons are in an atom of chlorine?

26.

How many neutrons in an atom of oxygen?

27.

How many neutrons in the isotope neon-22?

28.

How many neutrons in the isotope neon-20?

29.

Which of the following is a compound?

a)

Gold (Au)

b)

Oxygen (O2)

c)

Iron (Fe)

d)

Ammonia (NH3)

30.

What is the charge of a neutron?

a)

Positive

b)

Negative

c)

No charge

d)

Both positive and negative

31.

Which of the following is an example of a physical property?

a)

Density

b)

Reactivity with acid

c)

Ability to rust

d)

Flammability

32.

Which of the following is a chemical property?

a)

Density

b)

Ability to react with oxygen

c)

Color

d)

Melting point

33.

What is the main difference between a mixture and a compound?

a)

Mixtures retain the properties of their components; compounds have new properties.

b)

Compounds can be separated by physical means; mixtures cannot.

c)

Compounds are always gases; mixtures are always solids.

d)

Mixtures have a fixed ratio of components; compounds do not.

34.

Which subatomic particle is found in the nucleus and has a positive charge?

a)

Neutron

b)

Quark

c)

Electron

d)

Proton

35.

Which of the following is an example of a mixture?

a)

Hydrogen gas (H2)

b)

Table salt (NaCl)

c)

Steel

d)

Carbon monoxide (CO)

36.

Which subatomic particle determines the atomic number of an element?

a)

Proton

b)

Quark

c)

Neutron

d)

Electron

37.

Which of the following best describes a solution?

a)

A mixture where substances are evenly distributed

b)

A mixture with visible separate parts

c)

A pure substance made of only one type of atom

d)

A compound formed by chemical reactions

38.

Which of the following changes is a physical change?

a)

Baking a cake

b)

Melting ice

c)

Burning wood

d)

Rusting iron

39.

Which of the following is a chemical change?

a)

Boiling water

b)

Freezing juice

c)

Melting wax

d)

Burning paper

40.

Which subatomic particle is responsible for the mass number of an atom?

a)

Proton

b)

Electron

c)

Neutron

d)

Both protons and neutrons

41.

Which of the following best describes an element?

a)

A substance made of only one kind of atom

b)

A mixture of two or more substances

c)

A compound formed by chemical reactions

d)

A solution with evenly distributed particles

42.

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

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

43.

Potassium-39 has how many neutrons?

a)

19

b)

18

c)

20

d)

21

44.

Nickel-59 has how many neutrons?

a)

30

b)

31

c)

32

d)

33

45.

Bromine-80 has how many neutrons?

a)

41

b)

42

c)

44

d)

45

46.

76 protons and 114 neutrons

a)

Osmium-114

b)

Osmium-76

c)

Osmium-190

d)

Osmium-190.23

47.

12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

48.

9 protons and 9 neutrons

a)

Fluorine-18

b)

Fluorine-9

c)

Fluorine-16

d)

Fluorine-18.998

49.

How do you calculate mass number?

a)

Mass x percent

b)

Protons + Electrons

c)

Protons + Neutrons

d)

Neutrons + Protons + Electrons

50.

If an isotope has an atomic number of 15 and a mass number of 31, how many neutrons does it have?

a)

15

b)

16

c)

31

d)

46

51.

Which of the following isotopes has the most neutrons?

a)

Oxygen-16

b)

Oxygen-17

c)

Oxygen-18

d)

They all have the same number of neutrons.

52.

If two isotopes have the same mass number but different atomic numbers, what can you infer about them?

a)

They are isotopes of the same element.

b)

They have the same number of neutrons.

c)

They are not isotopes but different elements.

d)

They have the same number of protons.

53.

An isotope of nitrogen has 7 protons and 8 neutrons. What is its mass number?

a)

7

b)

8

c)

15

d)

22

54.
The electrons that are on the outer most region of the atom
a)
Shell Electrons
b)
Violent Electrons
c)
Valence Electrons
55.
This unit is represented by the combined number of protons and neutrons
a)
Atomic Mass
b)
Atomic Number
c)
Mass Number
56.
This number is represented by the number of protons in the atom
a)
Atomic Mass
b)
Atomic Number
c)
Mass Number
57.
The negative charge particles that float around the outside of the atom
a)
Proton
b)
Neutron
c)
Electron
58.
The area of the atom where protons and neutrons are found
a)
Electron Cloud
b)
Nucleus
c)
Energy Level
59.
A positively charged particle found in the nucleus of the atom
a)
Proton
b)
Electron
c)
Neutron
60.
The smallest possible unit matter can be divided into while still maintaining its properties.
a)
Proton
b)
Atom
c)
Element
61.
Most of the mass in an atom is made up of _____________________?
a)
protons and electrons
b)
protons and neutrons
c)
neutrons and electrons
d)
electrons and quarks
62.
What does the C represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
63.

What does the 6 represent?

a)

Atomic mass

b)

atomic number

c)

chemical symbol

d)

element name

64.
If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?
a)
12 neutrons
b)
12 electrons
c)
12 protons
d)
24 protons and neutrons
65.
Protons and Electrons balance the charge of an atom.
a)
True
b)
False
66.
Electric charges that are different _______ each other.
a)
Attract
b)
Repel
67.
Electric charges that are alike _______ each other.
a)
Attract
b)
Repel
68.
What charge does a proton have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
69.
What charge does an electron have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
70.

Which is NOT part of an atom?

a)

protons

b)

neutrons

c)

neurons

d)

electrons

71.

Electrons are located______.

a)

outside the nucleus

b)

inside the nucleus

72.
subatomic particles found on the outermost shell & responsible for the atom's reactivity
a)
neutrons
b)
valence electrons
c)
isotopes
d)
ions
73.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

74.

USE THE PERIODIC TABLE

How many valence electrons does sodium have?

a)

1

b)

2

c)

3

d)

4

75.

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

a)

31

b)

5

c)

15

d)

4

76.
Elements in the same column of the periodic table always have the same # of _______ as one another.
a)
Protons
b)
Neutrons
c)
Electrons
d)
Valence Electrons
77.

Which elements have the most similar chemical properties?

a)

boron and carbon

b)

oxygen and sulfur

c)

aluminum and bromine

d)

argon and silicon

78.
How many valence electrons are in an atom of Ba?
a)
2
b)
8
c)
4
d)
1
79.
Rows on the period table are called _____ while columns are called _____.
a)
groups, families
b)
groups, periods
c)
periods, groups
d)
families, groups
80.

The period that an element is in, tells you what?

a)

Number of protons

b)

Number of electrons

c)

Number of valence electrons

d)

Number of shells

81.

How many valence electrons does Hydrogen Have?

a)

1 Valence electron

b)

2 Valence electron

c)

3 Valence electron

d)

4 Valence electron

e)

5 Valence electron

82.

How many valence electrons does Helium Have?

a)

1 Valence electron

b)

2 Valence electron

c)

3 Valence electron

d)

4 Valence electron

e)

5 Valence electron

83.

Name this element.

a)

Argon

b)

Chlorine

c)

Aluminum

d)

Boron

84.

How many valence electrons are in this element?

a)

7

b)

6

c)

5

d)

2

85.
In a stable atom the amount of electrons is electron is equal to
a)
neutrons
b)
protons
c)
atomic mass
d)
neutrons + protons
86.

The outer most electrons are called...

a)

valence electrons

b)

heavy electrons

c)

emission electrons

d)

Excited electrons

87.

How many valence electrons are in this element?

a)

7

b)

6

c)

5

d)

2

88.
This could be the dot diagram of 
a)
Ne
b)
Si
c)
Al
d)
Be
89.

This is a correct dot diagram for oxygen (O)

a)

true

b)

false

90.

Which of these is incorrect?

a)
b)
91.

Which ones are acceptable?

a)
b)
c)
92.

This is a correct dot diagram for nitrogen (N)

a)

true

b)

false

93.

This is a correct dot diagram for carbon (C)

a)

true

b)

false

94.

This is a correct dot diagram for neon (Ne)

a)

true

b)

false

95.

This could be the dot diagram of

a)

Mg

b)

Cl

c)

C

d)

O

96.

Is this correct way to draw the Lewis Dot Structure for Carbon?

a)

Yes

b)

No, too many electrons

c)

No, not enough electrons

d)

No, dots are in wrong places

97.

Is this the correct Lewis Dot Structure for Boron?

a)

Yes

b)

No, missing electrons

c)

No, too many electrons

d)

No, dots are in wrong place.

98.
How many valence electrons are found in atoms of group 14?
a)
4
b)
3
c)
14
d)
16
99.
Valence electrons are the...
a)
Innermost electrons
b)
Middle electrons
c)
Outermost electrons
d)
Any electrons

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