Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Rank: 39

Answer

a. Number of protons in the nucleus, most to least: B=C, A. b. Number of neutrons in the nucleus, most to least: C, A=B . c. Number of electrons that normally surround the nucleus, most to least: B=C, A.

Work Step by Step

a. The number of protons is the atomic number. Uranium has an atomic number of 92, and thorium has an atomic number of 90. b. U-238 has 238 - 92 = 146 neutrons. Th-233 has 233 - 90 = 143 neutrons. U-235 has 235 - 92 = 143 neutrons. c. The number of electrons normally equals the number of protons (i.e., the atomic number).
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