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RE: Chemistry?
The electron configuration of iron is: [Ar] 4s2 3d6.
- 4s2 is not stable: the electrons can be given away easily so we get Fe2+.
- 3d6 is not stable: another electron can be given away and as a result we get Fe3+.
After that we have a stable configuration: [Ar] 4s0 3d5. Argon is stable (the octet); d5 is stable as well (half full d-orbital).
Yep, obviously, a chemist at heart, if not in profession.
You could have added the #science tag I think ...