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Iron is element number 26, so it has 26 protons and 26 electrons. (If the protons don't match the electrons, the atom is ionized, not neutral as usually assumed.)

The number of neutrons varies in the different isotopes of the element. On Earth, the proportions are: (Rounded numbers, see source for exact.)

  • 92% of 56Fe, with 30 neutrons
  • 6% of 54Fe, with 28 neutrons
  • 2% of 57Fe, with 31 neutrons
  • 1% of 58Fe, with 32 neutrons

Other numbers of neutrons are possible, but unstable. (54Fe may be unstable as well, but this hasn't been verified experimentally.)

These numbers result in an atomic weight of 55.8, from the most common 56Fe isotope with a small contribution from the lighter ones.

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How many protons neutrons and electrons does iron 56 have?

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