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So I know that there are exceptions for chromium and copper when doing electron configurations, but does anyone know exactly why this happens? My first thought is that it takes away an electron from another orbital, is this close to being correct?
Exactly what the above comment said. Half full and full shells are more stable than ones that are not. Thus, Cr and Cu since they are one away from being half full or full, we go ahead and put their d shell as 3d5 and 3d10 and then take away an electron from their 4s2 to make it 4s1.
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