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The MO diagram shows that the CO$\ce{CO}$ molecule forms three filled MO's with σ symmetry and two MO's with π symmetry. Of the five filled MO's (10 electrons) formed for CO$\ce{CO}$, only four of them can be half-filled from carbon electrons (4 valence electrons). So one of the filled MO's must have two electrons that originally came from the oxygen atom.

The MO diagram shows that the CO molecule forms three filled MO's with σ symmetry and two MO's with π symmetry. Of the five filled MO's (10 electrons) formed for CO, only four of them can be half-filled from carbon electrons (4 valence electrons). So one of the filled MO's must have two electrons that originally came from the oxygen atom.

The MO diagram shows that the $\ce{CO}$ molecule forms three filled MO's with σ symmetry and two MO's with π symmetry. Of the five filled MO's (10 electrons) formed for $\ce{CO}$, only four of them can be half-filled from carbon electrons (4 valence electrons). So one of the filled MO's must have two electrons that originally came from the oxygen atom.

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Josh Layfield
Josh Layfield
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The MO diagram shows that the CO molecule forms three filled MO's with σ symmetry and two MO's with π symmetry. Of the five filled MO's (10 electrons) formed for CO, only four of them can be half-filled from carbon electrons (4 valence electrons). So one of the filled MO's must have two electrons that originally came from the oxygen atom.