kliapatra replied to your post “Hey, you're a big sciencey guy, right? I have a question. On the periodic table you get copper and zinc. Why is it when you move from left to right, the only change in electron is of the previous S orbital and not the last D orbital? (i.e. Copper[Ni] 4s1 3d10...But Zinc ends in 4s2 3d10 right next to it) Sorry if this is a dumb question, dude. I've never taken a chemistry class before.”
A half-filled shell is more stable than a shell that's not half-filled or filled (3d9 is neither half-filled nor filled, whereas 4s1 is half-filled).
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