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Group 11 Metals Quantum Numbers

Posted: Sat Oct 29, 2016 8:53 pm
by Nick_Ida 1D
On our laminated periodic table, the group 11 metals (Cu, Ag, Au) all have an electron taken out of their s-orbital rather than their d-orbital for the electron configurations in their given spaces i.e-Cu: [Ar]3d10,5s1
Can anyone explain why it is noted the way it is? Also if I were to say for Cu, [Ar]3d9,4s2 would that be the same thing?

Re: Group 11 Metals Quantum Numbers

Posted: Sat Oct 29, 2016 10:34 pm
by Swati_Sharma_2D
This is because they are exceptions and do not follow the normal electron configuration rules (their d orbital is completely filled with only one electron in the s orbital). There are only a couple of elements that have exceptions, and Cu, Au, and Ag are three of them. It would not be correct to say that Copper's electron configuration is [Ar]3d94s2 because this is an incorrect electron configuration. Copper has one electron in the 4s orbital while its 3d orbital is completely filled, so its correct configuration should be written as [Ar]3d104s1.