Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 18 - Nuclear Chemistry - Questions for Review and Thought - Topical Questions - Page 817a: 12c

Answer

Positron emission or electron capture.

Work Step by Step

Potassium-38 with atomic number Z=19 is transformed to argon-38 with atomic number=18. There is one unit decrease in the atomic number and no change in the mass number. This is the case when a positron is emitted or when an electron is captured.
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