#### 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.

Published by
Cengage Learning

ISBN 10:
1133949649

ISBN 13:
978-1-13394-964-0

B

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