Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 24 - Problems: 24.22

Answer

See explanation below.

Work Step by Step

a. For carbon-15,N/Z ratio is 9/6, it has more neutrons, so to decrease neutrons, it undergoes beta decay. b. For 120 Xe,N/Z ratio is 66/54, is proton rich.SO it undergoes either positron emission or electron capture to become stable. c.For Thorium-224, N/Z ratio is 134/90. Atomic number of Thorium is 83, so it is unstable and undergoes alpha decay to become stable.
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