Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Explain - Page 635-636: 65

Answer

257. Fermium.

Work Step by Step

The atomic mass number of the element is the sum of the number of neutrons and protons: 157 + 100 = 257. Its atomic number is the number of protons, 100, so it is fermium, named for Enrico Fermi. This is discussed on pages 216-218.
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