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RE: Chemistry?
Yep! There is stability in having completely full octets. Its called an octet because there are 8 total electrons involved. Follow up question why does Iron like to have a 2+, or a 3+ charge? Think about the orbitals and the electrons to figure this one out.
The electron configuration of iron is: [Ar] 4s2 3d6.
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 ...