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Iron has 26 protons and electrons. For iron-56, it has 30 neutrons.
Iron has an atomic number of 26, which tells us it has 26 protons. For a neutral iron atom, the number of electrons is also 26. With an isotope like iron-56, to find the number of neutrons, subtract the atomic number from the mass number: 56 - 26 = 30 neutrons.
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