   Chapter 25.2, Problem 25.1CYU

Chapter
Section
Textbook Problem

(a) Six α and four β particles are emitted in the thorium-232 radioactive decay series be-fore a stable isotope is reached. What is the final product in this series? (b) The first three steps in the thorium-232 decay series (in order) are α, β, and β emission. Write an equation for each step.

(a)

Interpretation Introduction

Interpretation:

In the thorium-232 radioactive decay series before a stable isotope is reached. Six Alpha and Beta particles are emitted. The final product has to be found.

Introduction: When an unstable parent nucleus decays, the resulting daughter nucleus produced stable nucleus. If so, the daughter then decays and produces its own daughter nucleus. This sequential decay of one nucleus after another is called a radioactive decay series.

Explanation

Emission of six alpha-particle leads to a decrease of 24 in the mass number and a decrease of 12 in the atomic number; represented as 6(24He)emittedleadstoz-12A-24X.

Therefore, the given element is Thorium-232 leads to the isotope,

90232Thbecomes 90-12232-24Xas78208Pt

(b)

Interpretation Introduction

Interpretation:

The first three steps in the thorium-232 decay series for an Alpha particle Beta particle and Beta emission the equations has to be written.

Introduction: When an unstable parent nucleus decays, the resulting daughter nucleus produced stable nucleus. If so, the daughter then decays and produces its own daughter nucleus. This sequential decay of one nucleus after another is called a radioactive decay series.

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