   Chapter 25, Problem 29PS

Chapter
Section
Textbook Problem

Predict the probable mode of decay for each of the following radioactive isotopes, and write an equation to show the products of decay. (a) bromine-80⇄(c) cobalt-61 (b) californium-240⇄(d) carbon-11

(a)

Interpretation Introduction

Interpretation:

Probable mode of decay for the given radioactive isotope has to be predicted and equation for the given radioactive isotope has to be written.

Concept Introduction:

In this radioactive decay process the unstable isotopes loses their energy by emitting radiation. It is converted to stable isotopes. The emitting radiations are positron emission, gamma emission, beta emission and electron capture.

In beta decay, there will be a lose of electron from nucleus (neutron turns into proton): there will be no change in mass number and atomic number increases by one.

Explanation

Bromine-80 isotope is a radioactive isotope it has a high neutron/proton ratio. The ratio decreases on the action of beta decay. So mode of decay for B3580r is beta decay.

Equation is,

B3580r

(b)

Interpretation Introduction

Interpretation:

Probable mode of decay for the given radioactive isotope has to be predicted and equation for the given radioactive isotope has to be written.

Concept Introduction:

In this radioactive decay process the unstable isotopes loses their energy by emitting radiation. It is converted to stable isotopes. The emitting radiations are positron emission, gamma emission, beta emission and electron capture.

In alpha decay, there will be lose of He nucleus in which mass number decreases by four and atomic number decreases by two.

(c)

Interpretation Introduction

Interpretation:

Probable mode of decay for the given radioactive isotope has to be predicted and equation for the given radioactive isotope has to be written.

Concept Introduction:

In this radioactive decay process the unstable isotopes loses their energy by emitting radiation. It is converted to stable isotopes. The emitting radiations are positron emission, gamma emission, beta emission and electron capture.

In beta decay, there will be a lose of electron from nucleus (neutron turns into proton): there will be no change in mass number and atomic number increases by one.

(d)

Interpretation Introduction

Interpretation:

Probable mode of decay for the given radioactive isotope has to be predicted and equation for the given radioactive isotope has to be written.

Concept Introduction:

In this radioactive decay process the unstable isotopes loses their energy by emitting radiation. It is converted to stable isotopes. The emitting radiations are positron emission, gamma emission, beta emission and electron capture.

A positron is like an electron but it has a positive charge.

During a positron emission a proton changes into a neutron and the excess positive charge is emitted.

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