Answer
144 neutrons.
Work Step by Step
The alpha particle has a charge of +2 and a mass number of 4, so the new nucleus will have a mass number of 238 – 4 = 234, and an atomic number of 92 – 2 = 90. It is thorium, which has 234-90 = 144 neutrons.
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 30 - Nuclear Physics and Radioactivity - Questions - Page 879: 10
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