Copper and Chromium Exception

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Copper and Chromium Exception

Postby spark99 » Sun Oct 28, 2018 4:10 pm

Can someone explain to me the exception for copper and chromium? I heard it in the lecture, but I had trouble understanding it. Please clarify this for me.

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Re: Copper and Chromium Exception

Postby skyeblee2F » Sun Oct 28, 2018 4:20 pm

When you are writing out the electron configuration for copper and chromium you'll notice their d-orbitals contain 9 electrons. It is much more stable to have the full 10 electrons, so we take away an electron from the valence s-orbital and add it to the d-orbital. Thus, instead of copper being written as [Ar]3d^9 4s^2, it is written as [Ar]3d^10 4s^1. This exception generally applies to atoms whose orbitals are very close to being full or half full and explains the dips in the graph of electron affinity that Lavelle showed us in class.

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