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Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 5)

1
What does the term 'radioactive' mean?
Answer
(B)
Unstable and emitting radiation.
2
Which of the following properties could be used to differentiate between a metal and a non-metal?
Answer
A
B
C
3
Which of the following statements is true about elements in the same group (vertical column) of the periodic table?
Answer
(D)
They have similar chemical properties.
4
What makes a metal good for making electrical wires?
Answer
(C)
Good conductivity
5
What do isotopes of an element have in common?
Answer
(C)
Same atomic number
6
What is the key difference between a compound and a mixture?
Answer
A
B
7
Which property is most useful for distinguishing between a compound and a mixture?
Answer
(C)
Chemical bonding
8
What is meant by the term 'atomic number'?
Answer
B
D
9
What is the relative charge of a proton?
Answer
(C)
+1
10
The number of protons in an atom is equal to the:
Answer
(B)
Atomic number
11
How many electrons are needed to fill the second electron shell?
Answer
(C)
8
12
Which of these can NOT be broken down into simpler substances by chemical methods?
Answer
(B)
Elements
13
What type of matter is a pure substance?
Answer
A
B
14
What is the function of a proton?
Answer
(D)
To determine the element's identity.
15
What are the key characteristics of an element?
Answer
A
B
C
16
Which of the following are examples of physical properties?
Answer
A
C
17
What is a chemical bond?
Answer
(B)
A force of attraction that holds atoms together.
18
What kind of bond joins the atoms in a compound?
Answer
(D)
A chemical bond
19
What is the role of the neutron in an atom?
Answer
(B)
To stabilize the nucleus.
20
Which of the following is a use of isotopes?
Answer
(A)
Treating cancer
21
What is the valence of an element related to?
Answer
(C)
The number of electrons in the outermost shell.
22
What is the difference between an atom of Hydrogen and Deuterium?
Answer
(C)
Different number of neutrons.
23
What type of bond typically forms between a metal and a non-metal?
Answer
(C)
Ionic
24
What is one of the advantages of using radioactive isotopes in medicine?
Answer
(C)
They can be used to diagnose diseases.
25
What determines the chemical properties of an element?
Answer
(C)
The number of electrons and their arrangement.
26
What is the charge of an electron?
Answer
(B)
Negative
27
Which of the following statement(s) is/are correct concerning mixtures?
Answer
A
C
28
What is meant by the term valence electrons?
Answer
(B)
Electrons in the outermost shell.
29
What are valence electrons?
Answer
(B)
Electrons in the outermost shell of an atom.
30
Which of the following combinations is classified as a compound?
Answer
(C)
Sodium chloride (table salt).
31
What is the term for the sum of protons and neutrons in an atom?
Answer
(B)
Mass number
32
Which of the following is a characteristic of a metallic substance?
Answer
(C)
Luster
33
What are the main properties of radioactive isotopes?
Answer
(A)
They are unstable and emit radiation.