blazinfury Posted March 26, 2013 Posted March 26, 2013 I need to calculate the effective nuclear charge of Cu2+. The formula that I am using is #protons- (total# e- - valence e-). Cu config is [Ar]3d104s1 Cu2+ config is [Ar]3d9 So the total # of protons is 29. Total # of e- is 27 because we lost 2 due to the ionization. Now would the total number of valence e- be 17 because we are looking at the whole 3rd energy level? So would the answer be 29- (27-17)= 19? Thanks.
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