A) Cu and Cr
B) Cu and Se
C) Cu and Zn
D) Sc and Zn
Correct Answer: D
Sc $ (3d^{1}4s^{2}) $ has 631 kJ $ mo{{l}^{-1}} $ and $ Zn(3d^{10}4s^{2}) $ has $ 906kJ,mo{{l}^{-1}} $
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