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You are watching: What is the electron configuration for iron

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I am teaching my students exactly how to write the digital configuration of the facets of the routine table.Thus, complying with the rules on exactly how to to fill the orbitals, the digital configuration of stole (for example) is 1s2 2s2 2p6 3s2 3p6 4s2 3d6 , and also it is abbreviated form 4s2 3d6.However, I has not been simple to uncover the explanation ~ above why in any periodic table the is created as 3d6 4s2 instead. Same situation for many other elements.Why is that?

The reasoning is to condensation the electron configuration. Ar has the very same 1s2 2s2 2p6 3s2 3p6 configuration as that snippet in Iron. It"s completely to shorten out composing all the configuration. I aided out at a school and also they were doing the same thing, for this reason the teacher decided to have them compose out both the long version (1s2 2s2 2p6 3s2 3p6 4s2 3d6) and also then interpret that to the short version (Ar 4s2 3d6).

Dear Joseph,Thanks because that your rapid response.I entirely understand the abreviated form of the configuration.Actually my question was why in the periodic table 3d6 4s2 appears instead of 4s2 3d6.There should be a factor for that.Armando

It may just be a failure in the print. At some time people/ computer systems who transpose the details may put it in alpha-numeric order. It"s not wrong, every say, however its not ideal.

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You have the right to look in ~ the orbitals in two advantageous ways. The power of the orbitals and also the place of the orbitals. When someone to write 4s2 3d6, they space writing in stimulate of energy (orbitals fill in bespeak of energy). Once they compose 3d6 4s2, they are writing in order of location, the is, n=3 orbitals before n=4 orbitals. This is useful because when atoms lose electrons, they lose them according to their location. Electron in the 4s orbital space lost before electrons in the 3d orbital. Also, the critical orbitals listed are the valence orbitals.Electrons are filled in the 4s before the 3d (energy), but they are lost from the 4s before the 3d (location). This is why Fe develops a 2+ ion and also a 3+ ion (when the loses one of its d-orbital electrons).