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1s2 2s2 2p6 3s2 3p6 4s2

Long-hand version:

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6

Short-hand version:

[Ar] 4s^2 3d^6

Note: The "^" symbol means the the following number is in the form of a superscript.

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Q: What is the valence electron configuration of iron?
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