JEE Advanced Chemistry question

Second ionization energies of chromium and copper are larger than those of their neighbouring elements (V, Mn, Ni, Zn). It is due to the fact that

(A)Second electron in each case is removed from orbital
(B)Second electron is removed from stable half-filled 3d sub-orbit in case of chromium and from stable completely filled 3d sub-orbit in case of copperCorrect
(C)Electrode potential of these elements (Cr and Cu) are higher than those of their neighbouring elements
(D)Their atomic radii are different due to screening effect

Answer: (B)

Solution

has the stable, exchange-energy-maximised half-filled configuration (from neutral Cr, , losing the single electron first), and has the stable, completely filled configuration (from neutral Cu, ). Removing a further

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Question ID VK-159678