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


$^{205}Tl$ 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.
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