Q.

Aufbau principle does not give the correct arrangement of filling up of the atomic orbitals in

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a

Cu and Zn

b

Co and Zn

c

Mn and Cr

d

Cu and Cr

answer is D.

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Detailed 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)=1s2,2s22p6,3s23p63d5,4s1Cu(Z=29)=1s2,1s22p6,3s23p63d10,4s1
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Aufbau principle does not give the correct arrangement of filling up of the atomic orbitals in