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Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 4)

1
Which of the following is a characteristic of a metal?
Answer
(D)
It is malleable.
2
What can you tell about an atom if its valence shell is full?
Answer
(B)
The atom is inert and is stable.
3
What is the primary difference between a compound and an element?
Answer
(B)
Elements are a single type of atom; compounds are two or more elements chemically bonded.
4
What is the electric charge of an atom?
Answer
(C)
Neutral
5
What type of radiation can be used to treat cancer?
Answer
(D)
All of the above
6
Which of the following elements is a noble gas?
Answer
(C)
Argon (Ar)
7
Which of the following particles has the smallest relative mass?
Answer
(C)
Electron
8
Which part of an atom is involved in chemical reactions?
Answer
(D)
Electrons
9
Which one of the following is a mixture?
Answer
(C)
Steel
10
How many protons are in the element Sodium (Na)?
Answer
(B)
11
11
Which subatomic particles are found in the electron shells?
Answer
(C)
Electrons
12
Which of these is generally a property of a non-metal?
Answer
(D)
Brittle
13
What is the process of radioactive decay?
Answer
(C)
The spontaneous transformation of an unstable nucleus into a more stable one.
14
What kind of bond results from the transfer of electrons between atoms?
Answer
(B)
Ionic
15
Which of the following is an example of a mixture?
Answer
(C)
Air
16
In a mixture, the substances are:
Answer
(C)
Not chemically combined.
17
What is the relationship between the atomic number and the number of protons?
Answer
(C)
Atomic number is equal to the number of protons.
18
What is the relative mass of a neutron?
Answer
(B)
Approximately 1
19
Which property is generally used to distinguish between metals and non-metals?
Answer
(C)
Electrical conductivity
20
What does the half-life of a radioactive isotope represent?
Answer
(B)
The time it takes for half of the isotope to decay.
21
What is the total number of electrons in the second shell?
Answer
(B)
8
22
Which of the following is NOT a characteristic property of metals?
Answer
(D)
Low melting point
23
How many neutrons are in an atom of Sodium (Na) with a mass number of 23?
Answer
(B)
12
24
How many electrons are needed to fill the third electron shell?
Answer
(B)
8
25
If two atoms are isotopes, what must be true about them?
Answer
(C)
They have the same number of protons but different numbers of neutrons.
26
What is one of the main uses of a non-metal?
Answer
(C)
Insulation
27
Which of the following is a compound?
Answer
(C)
Water (H₂O)
28
Which of the following statements best describes a mixture?
Answer
(C)
A combination of two or more substances that are not chemically bonded.
29
What are the main properties of non-metals?
Answer
(B)
Brittle, and poor conductors of electricity
30
Which term describes the ability of a metal to be drawn into a wire?
Answer
(B)
Ductile
31
Which of the following particles contributes the least to the mass of an atom?
Answer
(C)
Electron
32
Where is the mass of an atom primarily located?
Answer
(C)
In the nucleus.
33
Which of the following is a characteristic of a noble gas?
Answer
(C)
They have a full outer shell of electrons
34
How are electrons arranged in an atom?
Answer
(B)
In shells or energy levels
35
What subatomic particles are involved in forming the nucleus?
Answer
(C)
Protons and Neutrons
36
Which of the following is a characteristic of mixtures?
Answer
B
C
D
37
Which of the following is/are considered a mixture?
Answer
B
D
38
How many electrons are in the first electron shell?
Answer
(A)
2
39
What is the term for atoms of the same element with the same number of protons but different numbers of neutrons?
Answer
(B)
Isotopes
40
Which of the following is NOT a subatomic particle?
Answer
(D)
Molecule
41
What is the number of neutrons in the most common isotope of hydrogen?
Answer
(A)
0
42
Which of the following properties is usually associated with non-metals?
Answer
(D)
Poor conductor of heat
43
Which of the following is an element that typically exists as a diatomic molecule?
Answer
(C)
Oxygen
44
Which of the following statements are correct about compounds?
Answer
A
B
D
45
What are the main roles of electrons in an atom?
Answer
(C)
Form chemical bonds and determine chemical properties.
46
What are the two main types of isotopes of an element?
Answer
(A)
Radioactive and stable
47
What is the charge of a neutron?
Answer
(C)
Neutral
48
What is the mass number of an atom?
Answer
(C)
The sum of protons and neutrons.
49
Which of the following elements would most likely be found in a compound?
Answer
(C)
Sodium
50
What is an atom?
Answer
(B)
The smallest particle of an element that can exist.