Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Part 7 - Multiple-Choice Practice Exam: 14

Answer

When an element ejects an alpha particle, the mass number of the resulting element reduces by four.

Work Step by Step

An alpha particle has two protons and two neutrons, and takes away 4 atomic mass units. This is discussed on page 629.
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