Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95a: 19

Answer

$^{205}Tl$ is more abundant.

Work Step by Step

Assuming their atomic weights are approximately equal to their mass numbers, with x being the first isotope's abundance (meaning $1-x$ is the second one's abundance): $203\times x + 205 \times (1-x) = 204.4$ $x=0.3$ $^{205}Tl$ is more abundant.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.