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Valence Electrons of Copper?

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TexasOMFS

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Just started on Chad's chem videos the other day and noticed a discrepancy between what he says and what my Kaplan DAT book says. So my DAT book says that a transition metal's (not an inner transition metal) valence electrons are it's outermost shell S electrons and the next innermost shell's D electrons. Meanwhile Chad says that this is the case ONLY when the D subshell is not full. So what happens in the case of copper which is [Ar] 4s1 3d10. 11 valence electrons or 1? Thanks.
 
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