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We didn't learn it in class but I'm pretty sure that's just another exception you just have to memorize (since it doesn't apply to Ni which should be in the same situation but is not an exception)
I looked up why that would be the case I sometimes dont understand how that d level works the way it does. What I found out was that full d orbitals are more stable than partially filled ones and that at higher energy levels are said to be degenerated. That means that the energy levels I guess are closer together and an e- can jump easily from one to the next. So just from that info that seems to explain why 5s has 0 and 4d has 10.
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