Chapter 2, Problem 98P

Interpretation Introduction

Interpretation:The percent abundance of ${}^{28}\text{Si}$ and ${}^{29}\text{Si}$ needs to be determined.

Concept Introduction: Isotope is defined as two atoms with same atomic number but different mass number. For an atom with three isotopes say $I_1$ , $I_2$ and $I_3$ , the average atomic weight of an atom can be calculated as follows:

  $M=\%A\times m\left(I_1\right)+\%A\times m\left(I_2\right)+\%A\times m\left(I_3\right)$

Here, % A is percentage abundance of respective isotope.