Atomic Structure and Radioactivity - SS1 Physics Past Questions and Answers - page 1
1
Which of the following is the correct definition of an atom?
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A
A tiny particle that cannot be divided into smaller parts.
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B
The smallest unit of matter that retains the properties of an element.
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C
A combination of protons, neutrons, and electrons.
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D
A subatomic particle with a positive charge.
2
What is the overall charge of an atom?
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A
Positive
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B
Negative
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C
Neutral
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D
Variable
3
Which subatomic particle has a positive charge?
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A
Proton
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B
Electron
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C
Neutron
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D
Nucleus
4
What is the approximate mass of an electron compared to a proton?
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A
Equal to the mass of a proton
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B
Twice the mass of a proton
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C
Much smaller than the mass of a proton
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D
Much larger than the mass of a proton
5
The atomic number of an element represents the number of:
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A
Protons in the nucleus
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B
Electrons in the nucleus
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C
Neutrons in the nucleus
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D
Electrons in the electron cloud
6
Which of the following subatomic particles is located outside the nucleus of an atom?
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A
Proton
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B
Electron
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C
Neutron
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D
Nucleus
7
The mass number of an atom is equal to the sum of:
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A
Protons and electrons
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B
Protons and neutrons
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C
Electrons and neutrons
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D
Protons, neutrons, and electrons
8
Describe the structure of an atom and the roles of its subatomic particles.
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9
Explain the concept of atomic number and how it relates to the identity of an element.
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10
Which subatomic particle has a positive charge?
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A
Proton
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B
Neutron
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C
Electron
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D
Nucleus
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