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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 34 - Reading Check Questions (Comprehension) - Page 653: 10
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