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I am understanding you to mean an iron-57 ion with a charge of 3+.

The atomic number of Fe is 26, which means that all Fe atoms or ions have 26 protons in their nuclei.

In a neutral Fe atom, the number of electrons would be the same as the number of protons, which is 26. The charge on the Fe ion is 3+, which means the Fe atom has given up 3 electrons. So the number of electrons in an Fe3+ ion is 26-3, which is 23.

The mass number of iron-57 = 57. The mass number is the sum of protons and neutrons in the atomic nuclei of iron-57 atoms. We know the number of protons is 26. The number of neutrons = mass number - the number of protons, which is 57-26 = 31 neutrons.

To summarize:

The number of protons in all Fe atoms is 26.

The number of electrons in an any Fe3+ ion is 23.

The number of neutrons in an iron-57 atom is 31.

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