(a)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(a)

Explanation of Solution
Alpha particle is emitted.
The parent nuclide is 232Th and the nuclide after the emission of particles is 228Ra.
Since, there is change of +4 in the mass number of the resultant nuclide; this indicates that the particle emitted is an alpha particle.
(b)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(b)

Explanation of Solution
Beta particle is emitted.
The parent nuclide is 228Ra and the nuclide after the emission of particle is 228Ac.
Since, there is no change in the mass number of the resultant nuclide; this indicates that the particle emitted is a beta particle.
(c)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(c)

Explanation of Solution
Beta particle is emitted.
The parent nuclide is 228Ac and the nuclide after the emission of particle is 228Th.
Since, there is no change in the mass number of the resultant nuclide; this indicates that the particle emitted is a beta particle.
(d)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(d)

Explanation of Solution
Alpha particle is emitted.
The parent nuclide is 228Th and the nuclide after the emission of particle is 224Ra.
Since, there is change of +4 in the mass number of the resultant nuclide; this indicates that the particle emitted is an alpha particle.
(e)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(e)

Explanation of Solution
Alpha particle is emitted.
The parent nuclide is 224Ra and the nuclide after the emission of particle is 220Rn .
Since, there is change of +4 in the mass number of the resultant nuclide; this indicates that the particle emitted is an alpha particle.
(f)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(f)

Explanation of Solution
Alpha particle is emitted.
The parent nuclide is 220Rn and the nuclide after the emission of particle is 216Po
Since, there is change of +4 in the mass number of the resultant nuclide; this indicates that the particle emitted is an alpha particle.
(g)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(g)

Explanation of Solution
Alpha particle is emitted.
The parent nuclide is 216Po and the nuclide after the emission of particle is 212Pb
Since, there is change of +4 in the mass number of the resultant nuclide; this indicates that the particle emitted is an alpha particle.
(h)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(h)

Explanation of Solution
Beta particle is emitted.
The parent nuclide is 212Pb and the nuclide after the emission of particle is 212Bi
Since, there is no change in the mass number of the resultant nuclide. Thus, the particle emitted is a beta particle.
(i)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(i)

Explanation of Solution
Beta particle is emitted.
The parent nuclide is 212Bi and the nuclide after the emission of particle is 212Po
Since, there is no change in the mass number of the resultant nuclide. Thus, the particle emitted is a beta particle.
(j)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(j)

Explanation of Solution
Alpha particle is emitted.
The parent nuclide is 212Po and the nuclide after the emission of particle is 208Pb
Since, there is change of +4 in the mass number of the resultant nuclide; this indicates that the particle emitted is an alpha particle.
(k)
Interpretation: Progressive decay series of Thorium- 232 ending up as lead- 208 is given. Nuclear particle emitted in each step of the series is to be stated.
Concept introduction: Nuclei of radioactive element decompose in various ways. There are two major categories. One involves a change in mass number of the decaying nucleus while others do not. Types of radioactive processes include α particle production, β particle production, γ ray production, electron capture and many others. Electron capture decay involves the capturing of one of the inner orbitals electrons by the nucleus.
Beta particle production decay involves the production of beta particle (0−1e) that is assigned mass number zero.
A helium nucleus 42He is produced in the alpha decay process.
(k)

Explanation of Solution
No particle is emitted.
The given species, that is 208Pb, is stable; hence, no particle is emitted.
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Chapter 19 Solutions
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