Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 30 - Nuclear Physics and Radioactivity - Questions: 10

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.
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