wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Atoms, elements, and compounds

Total questions: 120

Worksheet time: 4hrs 0mins

Name
Class
Date
1.

These contain only one kind of atom. 

a)

Element

b)

Mixture

c)

Compound

d)

Water

2.

Carbon Dioxide is a ______ 

a)

compound

b)

element

c)

mixture

3.

What is salad?

a)

Energy

b)

Elements

c)

Compounds

d)

Mixture

4.

What elements make up calcium hydroxide? (tick all the correct boxes)

a)

Calcium

b)

Oxygen

c)

Potassium

d)

hydrogen

5.

What elements make up silver nitrate? (tick all correct boxes)

a)

nitric acid

b)

nitrogen

c)

silver

d)

oxygen

6.

What elements make up calcium hydroxide? (tick all the incorrect boxes)

a)

calcium

b)

carbon

c)

hydrogen

d)

nitrogen

7.

These contain only one kind of atom. 

a)

Element

b)

Mixture

c)

Compound

d)

Water

8.

Carbon Dioxide is a ______ 

a)

compound

b)

element

c)

mixture

9.

The air is a _________. 

a)

element 

b)

compound

c)

mixture 

d)

energy 

10.

What is salad?

a)

Energy

b)

Elements

c)

Compounds

d)

Mixture

11.

What elements make up calcium hydroxide? (tick all the correct boxes)

a)

Calcium

b)

Oxygen

c)

Potassium

d)

hydrogen

12.

What elements make up silver nitrate? (tick all correct boxes)

a)

nitric acid

b)

nitrogen

c)

silver

d)

oxygen

13.

What elements make up calcium hydroxide? (tick all the incorrect boxes)

a)

calcium

b)

carbon

c)

hydrogen

d)

nitrogen

14.

Water is an element

a)

True

b)

False

15.

The diagram shows...

a)

elements

b)

compounds

c)

mixture of compounds

d)

mixture of elements

16.

When forming Fe2+, an iron atom has (gained/lost) _________ (#) ___ electrons

(a)  

17.

When forming S2- , a sulphur atom has (gained/lost) _________ (#) ___ electrons

(a)  

18.

What charge does an atom have when it GAINS electrons?

a)

neutral

b)

positive

c)

negative

d)

multicharge

19.

What is the mass number of bromine atom?

a)

35

b)

80

c)

45

d)

none of them

20.

How many neutrons does this bromine atom have?

a)

45

b)

35

c)

55

d)

80

21.

What two particles determine the mass number?

a)

Protons and electrons

b)

Neutrons and electrons

c)

Protons and neutrons

d)

Proton, Electron and Neutrons

22.

What type of atom is this?

a)

Ion

b)

Normal atom

c)

isotope

d)

compounds

23.

How many electrons does this magnesium ion have?

a)

10

b)

24

c)

12

d)

14

24.

What is the atomic number of this element?

a)

12

b)

11

c)

23

d)

24

25.

What type of atom is element C?

a)

Normal atom

b)

isotope

c)

ion

d)

molecules

26.

Atoms with equal numbers of protons, but

different numbers of neutrons are?

a)

Nuclear

b)

Isotope

c)

Ion

d)

element

27.

Which of the following is a compound?

a)

Si

b)

CO2

c)

Cl

d)

He

e)

Ti

28.

Which of the following represents an element?

a)

H2O

b)

HCl

c)

NaCl

d)

Au

e)

CaCO3

29.

This picture represents which of the following?

a)

element

b)

compound

30.

This picture represents which of the following?

a)

element

b)

compound

31.

Which of the following could be a symbol on the periodic table of elements?

a)

CC

b)

Cc

c)

cc

d)

CcC

e)

CK1

32.

What is NOT made up of two or more elements that are chemically combined?

a)

Element

b)

Compound

c)

Mixture

d)

Solid

e)

Liquid

33.

Which of the following is an element?

a)

Gold

b)

Air

c)

Water

d)

Carbon Dioxide

e)

Nitrous Oxide

34.

How many elements are there in CuSO4?

a)

1

b)

2

c)

3

d)

4

e)

5

35.

Water is made up of hydrogen and oxygen, two elements that were chemically combined. This makes water a(n)

a)

atom

b)

compound

c)

element

d)

mixture

36.

Which of the following substance is NOT a compound?

a)

Carbon dioxide

b)

Hydrogen

c)

Salt

d)

Sugar

37.
A compound is made of ________ atoms. 
a)
big 
b)
similar 
c)
different 
38.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
39.
What is salad?
a)
element
b)
compound
c)
mixture
40.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
41.

What elements make up calcium hydroxide? (tick all the correct boxes

a)

calcium

b)

water

c)

hydrogen

d)

copper

e)

oxygen

42.

Which of the following are examples of ELEMENTS?

a)

Oxygen

b)

Water

c)

F2

d)

Lemonade

e)

Sulfur Dioxide (SO2)

43.

Ozone (O3) is found in the atmosphere. Ozone is an example of a(n)

a)

element

b)

compound

c)

mixture

d)

atom

44.

The subscript 2 in H2O tells us

a)

There are 2 atoms of oxygen in one molecule of water

b)

There are 2 atoms of hydrogen in one molecule of water

c)

There are 2 molecules of water present

d)

The 2 tells me nothing, you wizard!

45.

All matter is made of _________.

a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
46.
If an atom has 3 electrons, how many protons does it have?
a)
1
b)
2
c)
4
d)
3
47.
The positively charged particles of an atom are the ________.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
48.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
49.

__________ are negatively charged particles that are in the orbitals around the nucleus.

a)

protons

b)

nucleus

c)

neutrons

d)

electrons

50.

A proton has a ___________ charge.

a)

positive

b)

negative

c)

neutral

d)

massive.

51.

A neutron has _________ charge or is ________.

a)

negative ... neutral

b)

positive .... neutral

c)

no .... negative

d)

no ... neutral

52.
Which is an electron?
a)
A
b)
B
c)
C
53.

The smallest part of any element. Made up of protons, neutrons and electrons.

a)

Atom

b)

AMU

c)

Ion

d)

Isotope

54.

Which list contains only objects made up of atoms?

a)

steel, water, sand, dolphin

b)

light, rock , apple, squirrel

c)

palm tree, electricity, salt, air

d)

paper, vinegar, heat, helium

55.

What is the correct formula for calculating how many neutrons are in an atom?

a)

Protons + Electrons= Neutrons

b)

Atomic mass - Atomic number= Neutrons

c)

Atomic mass + Atomic number = Neutrons

d)

Atomic mass - Protons = Neutrons

56.

Which TWO of the following subatomic particles are inside the nucleus?

a)

protons

b)

electrons

c)

neutrons

d)

There are no subatomic particles in the nucleus of an atom.

57.

Select the correct definition for an atom.

a)

The smallest part of an element that can exist.

b)

A substance made of only one type of atom.

c)

A substance made of more than one type of atom that are chemically bonded together.

d)

A substance made of more than one type of atom that are not chemically bonded together.

58.

Select the correct definition for an element.

a)

The smallest part of an element that can exist.

b)

A substance made of only one type of atom.

c)

A substance made of more than one type of atom that are chemically bonded together.

d)

A substance made of more than one type of atom that are not chemically bonded together.

59.

Select the correct definition for a compound.

a)

The smallest part of an element that can exist.

b)

A substance made of only one type of atom.

c)

A substance made of more than one type of atom that are chemically bonded together.

d)

A substance made of more than one type of atom that are not chemically bonded together.

60.

Elements can be found on the (a)   table.

61.

Select the diagram that shows an atom.

a)
b)
c)
d)
62.

Select the diagram that shows an element.

a)
b)
c)
d)
63.

Select the diagram that shows a compound.

a)
b)
c)
d)
64.

Select the elements from this list.

a)

Carbon dioxide

b)

Hydrogen

c)

Nitrogen

d)

Hydrochloric acid

e)

Iron

65.

Select the compounds from this list.

a)

Carbon dioxide

b)

Methane

c)

Nitrogen

d)

Hydrochloric acid

e)

Iron

66.

Select the compounds from this list.

a)

O2

b)

CO2

c)

HCl

d)

CH4

e)

Fe

67.

Select the elements from this list.

a)

O2

b)

CO2

c)

HCl

d)

CH4

e)

Fe

68.

The chemical formula for methane is CH4. How many carbon atoms are in a molecule of methane?

(a)  

69.

The chemical formula for carbon dioxide is CO2. How many oxygen atoms are in a molecule of carbon dioxide?

(a)  

70.

The chemical formula for water is H2O. How many hydrogen atoms are in a molecule of water?

(a)  

71.

The chemical formula for magnesium hydroxide is Mg(OH)2. How many oxygen atoms are in a molecule of magnesium hydroxide?

(a)  

72.

The word equation for a reaction is


magnesium + oxygen → magnesium oxide


What are the reactants in this reaction?

a)

Magnesium

b)

Oxygen

c)

Magnesium oxide

d)

oxide

73.

The word equation for a reaction is


sodium hydroxide + hydrochloric acid → sodium chloride + water


What are the products in this reaction?

a)

sodium hydroxide

b)

hydrochloric acid

c)

sodium chloride

d)

water

74.

The symbol equation for a reaction is


2Fe + O2 → 2FeO


What are the products in this reaction?

a)

Fe

b)

O2

c)

FeO

75.

What number is missing to balance the equation?


(a)   Cu + O2 → 2CuO

76.

What number is missing to balance the equation?


N2 + (a)   H2 → 2NH3

77.

Select all the statements that are true about elements.

a)

They can be found in the periodic table.

b)

Each element has a different atomic number.

c)

Elements contain one type of atom.

d)

Every element has a symbol which is the capital letter of it's name.

e)

Elements are grouped according to their properties.

78.

Atoms mostly consist of (a)   space.

79.

A column in the periodic table is called a ?

a)

Period

b)

Group

c)

Row

d)

Tally

80.

Select all the statements about atoms that are true.

a)

Atoms are mostly positive charge with some negative electrons dotted in it.

b)

Atoms are made up of sub-atomic particles.

c)

Atoms have a dense nucleus at the centre made up of protons and electrons.

d)

Atoms are indivisible units - they cannot be broken apart.

e)

An atoms nucleus is surrounded by a cloud of electrons.

81.

All elements can be categorized as metals or non-metals.

a)

True

b)

False

82.

Chlorine is an example of a non-metal element.

a)

True

b)

False

83.

Calcium is an example of a (metal or non-metal) element.

(a)  

84.

A proton has a relative mass of...

a)

1

b)

0.0005

c)

0

d)

3.14

85.

A neutron has a relative mass of...

a)

1

b)

0.0005

c)

0

d)

3.14

86.

An electron has a relative mass of...

a)

1

b)

0.0005

c)

0

d)

3.14

87.

What is the atomic number of this beryllium atom?

a)

1

b)

2

c)

3

d)

4

88.

What is the nucleon number of this beryllium atom?

a)

4

b)

7

c)

8

d)

9

89.

Select all the statements that are true about oxygen.

a)

Oxygen has an atomic number of 8.

b)

Each oxygen atom has 6 electrons in it's outer shell.

c)

Oxygen is diatomic.

d)

Oxygen has the chemical symbol Ox

e)

An oxygen atom can gain electrons to form an O²+ ion

90.

An ion is formed when an atom gains or loses an electron from it outermost shell.

a)

True

b)

False

91.

Select all the statements which are true about isotopes.

a)

Isotopes have an electrical charge because they gained or lost electrons.

b)

Isotopes have the same number of protons but a different number of electrons.

c)

Isotopes can be radioactive even if other isotopes of the same element are not.

d)

Isotopes of most elements exist in nature.

e)

Isotopes are rarely found naturally and mostly exist because they have been made by scientists.

92.
Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?
a)
Hydrogen is an element made of two or more kinds of atoms.
b)
Hydrogen is a compound made of only one kind of atom.
c)
Hydrogen is a compound made of two or more kinds of atoms.
d)
Hydrogen is an element made of only one kind of atom.
93.
The element oxygen, represented by the symbol O, is classified as
a)
a pure substance
b)
a compound
c)
a mixture
d)
a solution
94.

This is the smallest unit of an element.

a)

atom

b)

molecule

c)

compound

d)

nucleus

95.

Any combination of two or more atoms that are chemically combined is called this.

a)

molecule

b)

compound

c)

element

d)

pure substance

96.
Glucose (C6H12O6) contains atoms of carbon, hydrogen, and oxygen that are chemically bonded together.  What type of matter is glucose?
a)
Glucose is an element
b)
Glucose is a compound 
c)
Glucose is a mixture
d)
Glucose is a metal
97.
Which part of an atom is POSITIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
98.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A nucleus
d)
A molecule
99.
What part of an atom is NEGATIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
100.
Which part of an atom has no charge?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
101.
What is the picture displayed?
a)
Atom
b)
Element
c)
Molecule
d)
Compound
102.

What is the picture displayed?

a)

atom

b)

element

c)

compound

103.

What is the picture displayed?

a)

compound

b)

element

c)

molecule

104.
In an atom, what is the number of protons equal to?
a)
The number of electrons
b)
The number of molecules
c)
The number of neutrons
d)
The number of nucleii
105.
What forms when two atoms combine? 
a)
A nucleus
b)
A proton
c)
A molecule
d)
A neutron
106.
How many elements are on the periodic table?
a)
53
b)
116
c)
200
d)
160
107.

What is an element?

a)

Two or more atoms joined together.

b)

One of over 100 types of atoms

c)

Two or more different elements joined together.

d)

A particle with no charge found in the nucleus of an atom.

108.

What is a molecule?

a)

two elements bonded together (sharing electrons)

b)

a mixture of different substances

c)

smallest individual particles

d)

salt mixed in water

109.

What is the proton?

a)

a negatively charged particle that orbits the nucleus

b)

a neutral particle found in the nucleus

c)

a positively charged particle found in the nucleus

d)

a neutral particle that orbits the nucleus

110.

What is the electron?

a)

a negatively charged particle that orbits the nucleus

b)

a neutral particle found in the nucleus

c)

a positively charged particle found in the nucleus

d)

a neutral particle that orbits the nucleus

111.

What is the neutron?

a)

a negatively charged particle that orbits the nucleus

b)

a neutral particle found in the nucleus

c)

a positively charged particle found in the nucleus

d)

a neutral particle that orbits the nucleus

112.

What is the chemical symbol of the element Hydrogen?

a)

Hy

b)

H

c)

Hydro

d)

Hg

113.

Which of the following is a chemical formula?

a)

H2SO4

b)

Si

c)

Hg

d)

C

114.
Which of the following is found farthest from the center of an atom?
a)
nucleus
b)
proton
c)
neutron
d)
electron
115.
Which of the following best describes an atom?
a)
protons and neutrons grouped together
b)
protons and electrons grouped together
c)
a core (center) of protons and neutrons surrounded by electrons
d)
a core of electrons and neutrons surrounded by protons
116.
DIFFERENT kinds of atoms chemically combined to form a substance are
a)
Mixture
b)
Element
c)
Compound
d)
Substance
117.
What is the tiniest particle in the entire universe?
a)
cells
b)
gases
c)
atoms
d)
liquids
118.
What is the name of a single type of atom?
a)
cell
b)
proton
c)
element
d)
atom
119.
What is the term for combining 2 or more atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
120.
What is the picture displayed?
a)
Atom
b)
Element
c)
Molecule
d)
Compound

Similar Resources on Wayground

Savvas Physical Sci Unit 3 Energy, Motion, Force, and Work

115 questions

Savvas Physical Sci Unit 3 Energy, Motion, Force, and Work

quiz

Worksheet

•

8th - 11th Grade

7.5 Molecular Geometry Bank

122 questions

7.5 Molecular Geometry Bank

quiz

Worksheet

•

10th - 12th Grade

LS - 1B - Hypothesis & Experiment - Test Question Bank

121 questions

LS - 1B - Hypothesis & Experiment - Test Question Bank

quiz

Worksheet

•

7th - 9th Grade

Semester 1 2020 environmental science exam

115 questions

Semester 1 2020 environmental science exam

quiz

Worksheet

•

9th - 12th Grade

PS Unit 3 Review

115 questions

PS Unit 3 Review

quiz

Worksheet

•

10th Grade

2025 Midterm Exam Review

115 questions

2025 Midterm Exam Review

quiz

Worksheet

•

9th - 11th Grade

IGCSE CHEMISTRY: CHEMICAL BONDING

115 questions

IGCSE CHEMISTRY: CHEMICAL BONDING

quiz

Worksheet

•

9th Grade

Unit 2 Test REVIEW

118 questions

Unit 2 Test REVIEW

quiz

Worksheet

•

9th - 12th Grade