Question

..Write electronic configurations of Fe,
Fe?, Fe
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Answer 1

Answer:

[Ar] 3d6 4s2

Thus, following the rules on how to fill the orbitals, the electronic configuration of iron (for example) is 1s2 2s2 2p6 3s2 3p6 4s2 3d6 , and it is abbreviated form [Ar] 4s2 3d6. However, I has not been easy to find the explanation on why in any periodic table it is written as [Ar] 3d6 4s2 instead

Explanation:

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Answer 2

Answer:

Electronic configuration of iron is [Ar] 3d6 4s2.