Answer
B
Work Step by Step
The atomic weight of gallium (Ga) is 69.723, which is $x=\frac{69.723-69}{71-69}=36.15\%$ of the way between the two approximate isotope's weights (their mass numbers). Thus, B is the correct answer.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 2 Atoms, Molecules, and Ions - 2-4 Atomic Weights - Review & Check for Section 2-4 - Page 52: 2
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