# 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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