Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 2 - Atoms, Molecules, and Ions - Additional Exercises: 91


26 Protons 27 Neutrons 24 Electrons

Work Step by Step

Fe (Iron) has 26 protons as its atomic number is 26. Number of neutrons = atomic mass - number of protons = 53 - 26 = 27. Because $Fe^{2+}$ has a positive 2 charge, we subtract 2 from the atomic number to find the number of electrons: 24.
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