This option suggests that the electronic configuration of iron (II) ion (Fe2+) is [Ar] 4s0, 3d6. However, the correct electronic configuration should have electrons in both the 4s and 3d orbitals.
The correct electronic configuration of iron (II) ion (Fe2+) is [Ar] 4s2, 3d6. This configuration indicates that there are 2 electrons in the 4s orbital and 6 electrons in the 3d orbital for a total of 8 electrons.
This option suggests that the electronic configuration of iron (II) ion is [Ar] 4s2, 3d4, which is not correct. Iron (II) ion has 6 electrons in the 3d orbital, not 4.
This option suggests that the electronic configuration of iron (II) ion is [Ar] 4s2, 3d5, which is also not correct. Iron (II) ion has 6 electrons in the 3d orbital.
The correct electronic configuration of iron (II) ion (Fe2+) is B. [Ar] 4s2, 3d6.