A) Cu and Zn
B) Co and Zn
C) Mn and Cr
D) Cu and Cr
Correct Answer: D
Solution :
Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in copper and chromium because half-filled and completely filled electronic configuration of Cr and Cu have lower energy and therefore, more stable. \[Cr(Z=24):\text{ 1}{{\text{s}}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},3{{d}^{5}}4{{s}^{1}}\] \[Cu(Z=29):\text{ 1}{{\text{s}}^{2}},2{{s}^{2}},\text{ }2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{1}}\]
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