Chapter 2, Problem 46QP

Interpretation Introduction

Interpretation:

The natural abundance of $\text{Tl}-203$ and $\text{Tl}-205$ is to be determined for given atomic masses and average atomic mass.

Concept introduction:

The different masses of an atom of a given element is due to isotopes.

Atomic mass represents the average mass of the atom which produces that element.

The average atomic mass is calculated as follows:

$\text{Average atomic mass}={\displaystyle \sum _{i=1}^n{\text{f}}_i{\text{M}}_i}$

Here, ${\text{f}}_i$ is the fraction representing the natural abundance of isotopes and ${\text{M}}_i$ is the mass of the isotopes.

$\begin{array}{l}fraction,f=\frac{\%abundance}{100}\\ \%abundance=fraction\times 100\end{array}$