Electronic Configuration Question

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Discussion Overview

The discussion revolves around the electronic configuration of the element denoted as MO, specifically addressing why its valence electrons are represented as [Kr]5s^1 4d^5 rather than [Kr]5s^2 4d^4. The conversation touches on concepts of stability associated with half-filled d-orbitals and the implications for predicting electronic configurations.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the electronic configuration of MO, suggesting it could be [Kr]5s^2 4d^4 instead of [Kr]5s^1 4d^5.
  • Another participant explains that the stability of half-filled d-orbitals accounts for the observed configuration, referencing external resources for further clarification.
  • A third participant expresses a desire to understand how to predict such configurations, indicating a need for conceptual clarity.
  • It is noted that half-filled and fully filled orbitals confer extra stability, which may lead to electrons from s orbitals moving to inner orbitals, as seen in the configurations of other elements like Cr and Cu.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the electronic configuration of MO, with multiple viewpoints regarding the stability of half-filled versus fully filled orbitals and their implications for predicting configurations.

Contextual Notes

Limitations include the lack of clarity on the specific element being discussed (MO) and the potential confusion arising from notation errors regarding element symbols.

relativitydude
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How come the valance electrons of MO is [KR]5s^1 4d^5 and not

[KR]5s^2 4d^4
 
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Because of the extra stability associated with a half-filled d-orbital. See http://itl.chem.ufl.edu/2045/lectures/lec_11.html .

Scroll down to about half way where you see 'exchange' in blue; the configuration charts below that should be helpful as well.

PS: Be careful with your notation; the elements MO and KR do not exist, and should be written as Mo and Kr to denote the elements you speak of.
 
Last edited by a moderator:
Thank you, Sirus.

That makes sense, but how would I predict such a thing?
 
All half filled and full filled orbitals have extra stability.So much that the electron from s orbital may go to the inner orbital.check out e config of Cr,Cu etc.
 

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