College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 29 - The Nucleus - Learning Path Questions and Exercises - Multiple Choice Questions - Page 995: 9


(b) 91

Work Step by Step

When an alpha particle is emitted by a nucleus, that nucleus loses two protons. Np with $Z=93$ will have 93 protons. The alpha decay, therefore, would result in a nucleus containing 91 protons.
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