Answer
They each have 92 protons. U-238 has more neutrons than U-235 does.
Work Step by Step
All atoms of uranium have 92 protons.
U-238 has 238 - 92 = 146 neutrons.
U-235 has 235 - 92 = 143 neutrons.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 33 - Think and Explain - Page 635-636: 69
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