Answer
b) 30
Work Step by Step
The atom's mass number is about 55 amu. Because Mn has 25 protons, this means that there are 30 neutrons.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 2 Atoms, Molecules, and Ions - 2-3 Isotopes - Review & Check for Section 2-3 - Page 50: 1
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