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You are watching: Ground state electron configuration for fe


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I am to teach my students just how to compose the digital configuration of the aspects of the routine table.Thus, complying with the rules on just how 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 discover the explanation on why in any periodic table that is written as 3d6 4s2 instead. Same instance for many other elements.Why is that?

The reasoning is to condensation the electron configuration. Ar has actually the exact same 1s2 2s2 2p6 3s2 3p6 configuration together that snippet in Iron. It"s completely to shorten out composing all the configuration. I aided out in ~ a school and they were doing the very same thing, therefore the teacher made decision to have actually them compose out both the long version (1s2 2s2 2p6 3s2 3p6 4s2 3d6) and also then translate that come the brief version (Ar 4s2 3d6).
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Dear Joseph,Thanks for your fast response.I completely understand the abreviated form of the configuration.Actually my question was why in the routine table 3d6 4s2 shows up instead that 4s2 3d6.There need to be a reason for that.Armando

It may simply be a failure in the print. Sometime people/ computers who transpose the info may placed it in alpha-numeric order. It"s no wrong, per say, however its no ideal.

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You deserve to look at the orbitals in two helpful ways. The energy of the orbitals and the location of the orbitals. Once someone writes 4s2 3d6, they space writing in bespeak of power (orbitals fill in bespeak of energy). Once they compose 3d6 4s2, they room writing in bespeak of location, that is, n=3 orbitals before n=4 orbitals. This is useful due to the fact that when atoms lose electrons, they lose them according to your location. Electron in the 4s orbital are lost before electrons in the 3d orbital. Also, the last orbitals listed are the valence orbitals.Electrons are filled in the 4s prior to the 3d (energy), yet they are shed from the 4s before the 3d (location). This is why Fe creates a 2+ ion and also a 3+ ion (when that loses among its d-orbital electrons).