Fe(III) ions have how many d electrons?

Fe(III) ions have 5 d electrons. The atomic number of iron (Fe) is 26, which means it has 26 electrons in its neutral state. The electron configuration of a neutral iron atom is [Ar] 3d6 4s2. When it loses 3 electrons to become Fe(III), it loses the 2 electrons from the 4s orbital and 1 electron from the 3d orbital, leaving it with 5 electrons in the 3d orbital.