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C2 - Atoms, Elements and Compounds - Revision

Total questions: 98

Worksheet time: 2hrs 45mins

Name
Class
Date
1.
Q1. Which option correctly describes the relative charges and masses of the subatomic particles?
a)
A
b)
B
c)
C
d)
D
2.
Q2. The atomic number of element Q is 9 and its mass number is 19. In which group of the Periodic Table should element Q be placed?
a)
Group I
b)
Group II
c)
Group VII
d)
Group VIII
e)
D
3.
Q3. The diagram shows the atomic structure of an element. Which element is it?
a)
Carbon
b)
Beryllium
c)
Oxygen
d)
Boron
4.
Q4. The atomic structure of atoms Q, R, S and T are shown in the table. Which two atoms are isotopes?
a)
Q and S
b)
Q and T
c)
R and T
d)
R and S
5.
Q5. Substances can be broadly classified into three categories which are elements, compounds and mixtures. Which of the following statements is correct?
a)
Elements contain different atoms
b)
Compounds consist of elements that are not chemically combined
c)
Mixtures consist of elements that are chemically combined
d)
A mixture can contain elements and compounds
6.
Q6. The structure of four particles is described in the table. What are the correct values for X, Y and Z?
a)
X = 4, Y = 7, Z = 9
b)
X = 3, Y = 9, Z = 9
c)
X = 4, Y = 9, Z = 10
d)
X = 3, Y = 7, Z = 10
7.
Q7. Element X contains 12 of each sub-atomic particle. What is the correct Group number for element X?
a)
Group I
b)
Group II
c)
Group VII
d)
Group VIII
8.
Q8. Element X contains 4 electrons in its outer shell and 125 neutrons in its nucleus. What is element X?
a)
Carbon
b)
Beryllium
c)
Tin
d)
Lead
9.
Q9. Potassium fluoride is an ionic compound formed when one atom of potassium bonds with one atom of fluorine. Which row correctly describes the charge and electronic configuration of each ion in the compound?
a)
A
b)
B
c)
C
d)
D
10.
Q10. A section of the Periodic Table is shown below. The electronic structure of elements W, X, Y and Z are shown in the table. Which elements have the correct electronic structure?
a)
W and X
b)
Y and Z
c)
W and Y
d)
X and Z
11.
Q11. The X+ ion of element X has 16 electrons and a nucleon number of 37. What is the element X?
a)
Sulfur
b)
Argon
c)
Chlorine
d)
Fluorine
12.
Q12. Which row of the table correctly describes the link between outer shell electrons, Group number and Period number?
a)
A
b)
B
c)
C
d)
D
13.
Q13. Which row correctly describes the number of outer shell electrons and properties of isotopes?
a)
A
b)
B
c)
C
d)
D
14.
Q14. A selenide ion has the following notation. Which row correctly describes the subatomic particles in a selenide ion?
a)
A
b)
B
c)
C
d)
D
15.
Q15. What change occurs to an atom when it forms a negative ion?
a)
It loses electrons.
b)
It gains protons.
c)
It gains electrons.
d)
It loses protons.
16.
Q16. "Lithium and chlorine react together to form lithium chloride. During formation, each lithium atom…..1….. one …..2….. which is completely …..3….. to the chlorine atom. " What words correctly fill gaps 1, 2 and 3?
a)
A
b)
B
c)
C
d)
D
17.
Q17. Which of the statements describes ionic bonding?
a)
Electrostatic attraction between atoms
b)
Electrostatic attraction between positively charged particles and delocalised electrons
c)
Electrostatic attraction between oppositely charged ions
d)
Electrostatic attraction between the nuclei of two atoms and a shared pair of electrons
18.
Q18. The structure of an ionic compound, sodium chloride, is a lattice structure. Which of the following statements about an ionic lattice structure is NOT true?
a)
There is a regular arrangement of ions in the lattice
b)
The layers of ions slide over each other easily in the lattice
c)
The ions are arranged with alternating anions and cations
d)
Strong electrostatic forces of attraction occur between oppositely charged ions
19.
Q19. Magnesium is a Group II element and chlorine is a Group VII element. These elements react together to form an ionic compound. Which row is correct?
a)
A
b)
B
c)
C
d)
D
20.
Q20. Which element does not form a stable ion with the same electronic configuration as neon?
a)
Magnesium
b)
Fluorine
c)
Sodium
d)
Chlorine
21.
Q21. The electronic configuration of an ion was determined to be 2,8,8. What could the identity of the ion be?
a)
A
b)
B
c)
C
d)
D
22.
Q23. The table below shows the properties of four substances, W, X, Y and Z. Use the information in the table to identify the substance that is an ionic compound.
a)
A
b)
B
c)
C
d)
D
23.
Q24. Calcium reacts with fluorine to form calcium fluoride Which statement describes what happens to calcium atoms in this reaction?
a)
Calcium ions lose electrons to form positive charges. .
b)
Calcium atoms gain 3 electrons to form positive ions.
c)
Calcium ions gain 2 electrons to form positive ions.
d)
Calcium atoms lose 2 electrons to form positive ions.
24.
Q25. Ionic compounds are formed when a metal reacts with a nonmetal. Which two elements combine to form this kind of compound?
a)
S and T
b)
R and S
c)
Q and R
d)
Q and T
25.
Q26. The electronic structures of atoms X and Y are shown. What is the formula of the compound produced?
a)

X2Y

b)

X2Y2

c)

X2Y4

d)
XY
26.
Q26. The electronic structures of atoms X and Y are shown. What is the formula of the compound produced?
a)

X2Y

b)

X2Y2

c)

X2Y4

d)
XY
27.
Q27. Ionic compounds are formed when metals react with nonmetals. Which row correctly describes the electron transfer when an ionic bond is formed and the nature of the bond?
a)
A
b)
B
c)
C
d)
D
28.

Q28. Potassium and bromine chemically combine to form the compound potassium bromide. During formation, each bromine atom…..1….. one electron which is completely …..2….. from the outer shell of the potassium atom. The …..3….. force of attraction is formed from the attraction between the opposite charges on each ion. What words correctly fill gaps 1, 2 and 3?

a)
A
b)
B
c)
C
d)
D
29.
Q29. The bonding present in a substance determines the structure and properties of that substance. Which of the following statements is a correct description of the structure of an ionic compound?
a)
A lattice structure with an irregular arrangement of alternating positive and negative ions
b)
A lattice structure with a regular arrangement of alternating positive and negative ions
c)
A random structure with a regular arrangement of alternating positive and negative ions
d)
A random structure with an irregular arrangement of alternating positive and negative ions
30.
Q30. A student analysed an ionic compound and a covalent compound using a melting point apparatus. She found the ionic compound had a much higher melting point than the covalent compound. Which statement explains this observation?
a)
Ionic compounds are formed from metals only
b)
Ionic compounds are formed from nonmetals and nonmetals.
c)
There are strong electrostatic forces of attraction in ionic compounds.
d)
There are strong intermolecular forces in ionic compounds.
31.
Q31. Which of the following compounds are formed by covalent bonding? 1 Potassium fluoride (KF) 2 Propane (C3H8) 3 Carbon dioxide (CO2) 4 Lithium bromide (LiBr)
a)
2 and 3
b)
2 and 4
c)
1, 2 and 3
d)
1 and 4
32.
Q32. Which row correctly describes a simple covalent compound?
a)
A
b)
B
c)
C
d)
D
33.
Q33. Which statement about bonding is not correct?
a)
Covalent bonding involves non metal elements.
b)
Covalent bonding involves electron sharing.
c)
Covalent bonding involves electron transfer.
d)
Covalent bonding does not involve metal elements.
34.
Q34. The electronic configurations of four different atoms are shown below. Which atoms form covalent compounds?
a)
W and X
b)
W, X and Y
c)
W and Z
d)
X, Y and Z
35.
Q35. Carbon dioxide is a simple molecular substance in which the molecules are formed by covalent bonding between one carbon atom and two oxygen atoms. Which dot and cross diagram below shows the correct outer shell arrangement of electrons in a molecule of CO2 ?
a)
A
b)
B
c)
C
d)
D
36.
Q36. Dot and cross diagrams for four covalent molecules are shown below. Which diagram is incorrect?
a)
A
b)
B
c)
C
d)
D
37.
Q37. Which statement about methane (CH4) is correct?
a)
It has a high melting point due to strong covalent bonds between atoms
b)
It has a low melting point due to weak covalent bonds between the molecules
c)
It has a low boiling point due to weak intermolecular forces between molecules
d)
It has a high boiling point because of strong intermolecular forces between molecules
38.
Q38. A covalent molecule M contains a total of four shared electrons. What is M?
a)
Carbon dioxide
b)
Oxygen
c)
Nitrogen
d)
Methane (CH4)
39.
Q39. The structures of two solids X and Y are shown below. What are the correct uses of these structures?
a)
A
b)
B
c)
C
d)
D
40.
Q40. Which statement correctly describes the bonding in metals?
a)
A lattice of negative ions in a “sea of electrons”.
b)
A lattice of positive ions in a “sea of electrons”.
c)
A lattice of neutral atoms with delocalised electrons.
d)
A lattice of negative ions with delocalised electrons.
41.

Q41. Which row provides a correct description of the properties of metals?

a)
A
b)
B
c)
C
d)
D
42.

Q42. Which statement correctly describes the structure of macromolecules?

a)
Giant molecular crystal which is held together by weak intermolecular forces.
b)
Giant molecular crystal which is held together by strong ionic bonds.
c)
Giant molecular crystal which is held together by weak metallic bonds.
d)
Giant molecular crystal which is held together by strong covalent bonds.
43.

This is any combination of two or more atoms from different elements that are chemically combined.

a)

compound

b)

mixture

c)

element

d)

pure substance

44.

This number tells you how many protons are in each atom of a specific element and how many electrons there are in each unreacted atom from that element.

a)

atomic number

b)

atomic mass

c)

number of electrons

d)

chemical symbol

45.
Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?
a)
atom
b)
mixture
c)
element
d)
compound
46.

Which statement is true about a mixture?

a)

A mixture can be described by a chemical formula

b)

A mixture can be broken down into its basic substances through physical methods

c)

A mixture is created through a chemical reaction

d)

A mixture cannot be broken down into simpler substances

47.

What is a compound?

a)

Two or more than two different elements chemically bonded together.

b)

Two of the same elements bonded together.

c)

A mixture of different substances.

d)

Two substances stuck together with glue.

48.
What does the diagram show?
a)
A mixture of two elements
b)
A pure compound
c)
A mixture of two compounds
d)

A mixture of a compound & an element

49.

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.

50.

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.

51.

Select ALL elements from this list.

a)

Carbon dioxide (CO2)

b)

Hydrogen (H2)

c)

Nitrogen (N2)

d)

Hydrochloric acid (HCl)

e)

Iron (Fe)

52.

Select ALL compounds from this list.

a)

O2

b)

CO2

c)

HCl

d)

CH4

e)

Fe

53.

How many electrons does a Si atom contain? (click to see image)

a)
14
b)
28
c)
2
d)
4
54.

Nucleon is the name of ?

a)

Protons and Neutrons

b)

Protons and Electrons

c)

Electrons and Neutrons

d)

Protons only

e)

Neutrons only

55.

What is the electronic configuration of Lithium?

a)

2.8.8

b)

2.2.2

c)

2.8.5

d)

2.1

56.

How many electron shells (energy levels) does this atom have?

a)
1
b)
2
c)
3
d)
4
57.
The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.
a)
9
b)
10
c)
19
d)
28
58.

The electronic configuration of Ca is?

a)

2,8,8,2

b)

2,8,8,8,8,6

c)

2,8,8

d)

2,8,8

59.
FIND THE ELECTRONIC CONFIGURATION OF Cl (At no = 17)
a)
2,8,7
b)
2,8,8
c)
2,8,6
d)
2,8
60.

Mg (12) is belong to ...

a)

Group I

b)

Group II

c)

Group VIII

d)

Period 2

e)

Period 1

61.

In the Periodic Table, an element is arranged in group depend on ...

a)

the number of valence electrons

b)

the number of shells occupied by electrons

c)

the number of electrons in the innermost shell

d)

the atomic number (number of protons)

62.

In the Periodic table, an element is divided into period due to its ...

a)

atomic number

b)

mass number

c)

number of valence electrons (electrons in the outer most shell)

d)

number of shells occupied by electrons

63.

The atomic mass number of an atom helps people know about ... (Choose ALL correct answers)

a)

the number of protons

b)

the number of protons and electrons

c)

the number of protons and neutrons

d)

the number of nucleons

e)

the number of neutrons and electrons

64.

The Valence electrons is known as

a)

the number of protons in the nucleus

b)

the number of electrons in the innermost shells

c)

the number of electrons in the outermost shells

d)

the number of shells occupied by electrons

65.

The Valence shell is known as

a)

the mass number of the atom

b)

the number of electrons in the innermost shells

c)

the outermost shells of the atom

d)

the number of shells occupied by electrons

e)

the innermost shells of the atom

66.

A Sulfur ions has the atomic number of 16.

The number of electrons in the Sulfur ion is ...

a)

14

b)

16

c)

18

d)

20

67.

An atom lose (give out) electron(s) and turns into ...

a)

a positive ion

b)

a negative ion

c)

a neutral atom

68.

What is the difference between two isotopes of Neon: Neon-20 and Neon-22?

a)

They have different numbers of electrons.

b)

They have different numbers of neutrons.

c)

They have different atomic numbers.

d)

No difference.

69.

If a proton is added or removed from an atom, what happens?

a)

It becomes a different element.

b)

It becomes a different isotope.

c)

Nothing happens.

70.

Which of these determines the identity of an atom?

a)

proton

b)

neutron

c)

valence electron

d)

protons and neutrons

71.

If X is the symbol for an element, select the two symbols represent isotopes of the same element.

a)

7735X77_{35}X   

b)

7937X79_{37}X   

c)

8136X81_{36}X  

d)

8135X81_{35}X  

72.

Noble gases are...

a)

Happy and stable because they have full valence electrons

b)

Happy BUT UNSTABLE because they are gases

c)

Not happy because they don't want to be noble

d)

Not happy but stable because they are group number 18

73.

Why do all bonds form?

a)

An atom want to have full filled outermost shell and becomes more stable

b)

so an atom can become unstable and tend to change.

c)

so the number of protons and electrons can be equal.

d)

so they can be able to gain neutrons.

74.

Valence electrons are found

a)

in the outermost shell (energy level)

b)

in the innermost shell (energy level).

c)

in any electron shell.

d)

in the nucleus of the atom.

75.

An atom with 1 valence electron 'needs' to have a full shell, so it can either gain 7 electrons or lose 1.

Which is more likely to occur?

a)

nothing

b)

gain 7 electrons

c)

give out (lose) 1 electron

76.

How do covalent bonds form?

a)

by sharing electrons between a metal and a non-metal atoms

b)

by donating or receiving electrons in the outermost shell

c)

by sharing electrons between two or more than two non-metal atoms

d)

by donating or receiving protons

77.

How many valence electrons does Boron (B) have? (you can use The Periodic Table)

a)

1

b)

2

c)

3

d)

4

78.

When an atom loses (an) electron(s), it becomes a ... (choose all that apply)

a)

positive ion

b)

negative ion

c)

cation

d)

anion

79.

Atoms are most stable when their outer shell is full or complete.

a)

true

b)

false

80.

How are ionic bonds formed?

a)

by the transferring of electrons

b)

by sharing of electrons

c)

by the transferring of protons

d)

by sharing of neutrons

81.

Group numbers on the periodic table help us determine

a)

number of valence electrons

b)

state of the element (solid, liquid, gas)

c)

the number of shells covered by electrons

d)

the melting point of the element

82.

Water (H2O) is an example of ...

a)

molecular compound (covalent compound)

b)

ionic compound

c)

a pure element

d)

a mixture

83.

Table Salt (NaCl) is an example of ...

a)

ionic compound

b)

covalent compound

c)

a mixture

d)

a pure element

84.

Atoms involved in a covalent bond are not charged, while atoms involved in an ionic bond are charged (negative or positive)

a)

true

b)

false

85.

Ionic bonds form between metals and ...

(a)  

86.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
87.

If an atom has no charge, which of the following must be true?

a)

It has more neutrons than protons or electrons.

b)

There are only neutrons inside the atom.

c)

Its number of protons is equal to its number of electrons.

d)

The neutrons in the atom outnumber the electrons and protons.

88.

Why don't noble gases form bonds?

a)

Noble gases do form bonds

b)

They all have a full outermost shell and be stable

c)

They only bond with each other

89.

What charge will a Neon ion have?

a)

+1

b)

-1

c)

-8

d)

Neon does not form ions.

90.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
91.

MgO has

a)

Ionic bonding

b)

Metallic bonding

c)

Covalent bonding

92.

Predict what type of bond would form between Mg and Cl.

a)

Ionic

b)

Covalent

c)

Metallic

d)

Polar Covalent

93.

If an atom loses two electrons, what charge will it have?

a)

+2

b)

-2

c)

+1

d)

-1

94.

Using the image, identify what type of chemical bond would most likely be formed. (choose all that apply)

a)

An ionic bond because there are positive and negative ions.

b)

A covalent bond because the electrons are being shared.

c)

An ionic bond because it happens by transfer of electron

d)

An ionic bond because it happens between two non metals.

95.

CH4, this compound has ...

a)

ionic bond

b)

covalent bond

96.

What do atoms do to become anions?

a)

lose electrons

b)

gain electrons

c)

lose protons

d)

gain protons

97.
Which of the following is an ionic bond?
a)
H3N
b)
CaCl2
c)
NO2
d)
SCl
98.

Properties of ionic bonds ... (choose all that apply)

a)

are strong bonds

b)

are weak bond

c)

have both low melting and boiling points

d)

have both high melting and boiling point

e)

have high conductivity when they are in solid state

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