Conceptual Physics (12th Edition)

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

Chapter 34 - Reading Check Questions (Comprehension): 10

Answer

The isotope is Np-239.

Work Step by Step

When U-239 emits a beta particle, the mass is unchanged but the atomic number goes up by one, from 92 to 93. A beta particle has a charge of -1e. This is discussed on page 643.
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