electron config. of Fe

[Smooth Operater]

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How would you write the electron configuration of Fe?

electron configuration of Fe: 1s2, 2s2, 2p6,3s2,3p6, 3d6, 4s2 ?

Is it this right? I always get confused in the order for n = 3 shell group. Thanks!

 

[How Sleepy??!!]

Yes, that looks correct. The order goes from "s" to "p" to "d" to "f", each shell holding more electrons. But the tricky part is to remember that when Fe becomes a positive ion, you remove the electrons from its outermost shell first - namely, the 4s2 becomes a 4s and so on. Many people just take away the "3d6" electron (making it "3d5...) and forget that it is not the outer shell.