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You are watching: What is the electron configuration for iron

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I am to teach my students how to compose the electronic configuration the the elements of the routine table.Thus, following the rules on how to to fill the orbitals, the digital configuration of steel (for example) is 1s2 2s2 2p6 3s2 3p6 4s2 3d6 , and also it is abbreviated type 4s2 3d6.However, I has not been basic to discover the explanation ~ above why in any periodic table it is composed as 3d6 4s2 instead. Same instance for plenty of other elements.Why is that?

The thinking is to condensation the electron configuration. Ar has the same 1s2 2s2 2p6 3s2 3p6 configuration together that snippet in Iron. It"s purely to shorten out composing all the configuration. I aided out in ~ a school and also they were doing the very same thing, for this reason the teacher determined to have them compose out both the lengthy version (1s2 2s2 2p6 3s2 3p6 4s2 3d6) and then translate that come the short version (Ar 4s2 3d6).

Dear Joseph,Thanks for your quick response.I entirely understand the abreviated type of the configuration.Actually my inquiry was why in the regular table 3d6 4s2 appears instead that 4s2 3d6.There have to be a reason for that.Armando

It may simply be a wrong in the print. Sometime people/ computer systems who transpose the details may put it in alpha-numeric order. It"s no wrong, every say, however its not ideal.

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You have the right to look at the orbitals in two beneficial ways. The energy of the orbitals and the location of the orbitals. As soon as someone to write 4s2 3d6, they are writing in stimulate of energy (orbitals to fill in order of energy). Once they write 3d6 4s2, they are writing in stimulate of location, the is, n=3 orbitals before n=4 orbitals. This is useful due to the fact that when atoms shed electrons, they lose them follow to their location. Electrons in the 4s orbital are lost prior to electrons in the 3d orbital. Also, the last orbitals noted are the valence orbitals.Electrons space filled in the 4s prior to the 3d (energy), however they are lost from the 4s prior to the 3d (location). This is why Fe creates a 2+ ion and likewise a 3+ ion (when the loses among its d-orbital electrons).