In 3d-series, which two elements exhibit an anomalous configuration ?

 In 3d-series, which two elements exhibit an anomalous configuration ?
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 Chromium Cr(Z=24) = [Ar] 4s1 3 d5 Copper(Cu)(Z=29)= [Ar] 4s1 3 d10 In transition series the element with maximum Ionization energy is. Zinc – due to stable electronic configuration   
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