What is the correct electron configuration of iron (Fe, Z=26)?
✓ Correct Answer: Option A
Iron: [Ar] 3d6 4s2. The 4s orbital fills before 3d, and iron has 8 electrons beyond the Ar core distributed as 3d6 4s2.
Iron: [Ar] 3d6 4s2. The 4s orbital fills before 3d, and iron has 8 electrons beyond the Ar core distributed as 3d6 4s2.