   Chapter 25, Problem 41PS

Chapter
Section
Textbook Problem

Iodine-131 is used to treat thyroid cancer.(a) The isotope decays by β-particle emission. Write a balanced equation for this process.(b) Iodine-131 has a half-life of 8.04 days. If you begin with 2.4 μg of radioactive 131I, what mass remains after 40.2 days?

(a)

Interpretation Introduction

Interpretation: Equation for Iodine-131 decays by β particle emission has to be written.

Concept introduction:

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

The radioactive isotope of Iodine-131 is converted into Xenon-131 by the emission of beta particle. In this nuclear decay atomic number only changed there is no change in atomic mass. 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. The equation is as follows,

I53131</

(b)

Interpretation Introduction

Interpretation:

The remaining mass of Iodine-131 isotope after 40.2days has to be calculated.

Concept introduction:

Half–life period: It is the time required for the reactant (substrate) concentration to reduce to the one-half of its initial concentration.

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