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You are watching: What is the electron configuration of iron

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I am to teach my students how to create the digital configuration the the aspects of the periodic table.Thus, following the rule on exactly how to fill the orbitals, the electronic configuration of iron (for example) is 1s2 2s2 2p6 3s2 3p6 4s2 3d6 , and also it is abbreviated kind 4s2 3d6.However, I has not been easy to find the explanation on why in any type of periodic table that is created as 3d6 4s2 instead. Same case 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 purely to shorten out composing all the configuration. I helped out at a school and also they to be doing the same thing, therefore the teacher chose to have them create out both the long version (1s2 2s2 2p6 3s2 3p6 4s2 3d6) and also then translate that to the brief version (Ar 4s2 3d6).

Dear Joseph,Thanks because that your quick response.I totally understand the abreviated kind of the configuration.Actually my question was why in the routine table 3d6 4s2 appears instead of 4s2 3d6.There need to be a factor for that.Armando

It may simply be a mistake in the print. At some point people/ computer systems who transpose the information may placed it in alpha-numeric order. It"s not wrong, per say, yet its no ideal.

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You deserve to look in ~ the orbitals in two advantageous ways. The power of the orbitals and the location of the orbitals. When someone write 4s2 3d6, they room writing in stimulate of power (orbitals fill in bespeak of energy). As soon as they compose 3d6 4s2, they space writing in stimulate of location, the is, n=3 orbitals prior to n=4 orbitals. This is useful due to the fact that when atoms lose electrons, they shed them according to their location. Electrons in the 4s orbital room lost prior to electrons in the 3d orbital. Also, the last orbitals provided are the valence orbitals.Electrons space filled in the 4s before the 3d (energy), but they are shed from the 4s prior to the 3d (location). This is why Fe creates a 2+ ion and likewise a 3+ ion (when it loses one of its d-orbital electrons).