General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 20 - Nuclear Chemistry - Questions and Problems - Page 870: 20.86

Answer

Please see the work below.

Work Step by Step

We know that $Al-24$ has fewer neutrons as compared to stable $Al-27$, hence it is expected to decay to nucleus with a lower atomic number. $Al-30$ has more electrons, hence it is expected to decay by beta emission.
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