Which of the following has maximum number of unpaired d-electrons

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$Zn$

${Fe}^{2 +}$

${Ni}^{3 +}$

${Cu}^{+}$

answer is B.

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Detailed Solution

Zn = Z= 30 , Electronic configuration - ( Ar ) 4s²3d ¹⁰ , number of unpaired d-electrons = 0

Fe = Z = 26 , Electronic configuration - ( Ar ) 4s²3d⁶

Fe ⁺²electronic configuration - ( Ar ) 4s⁰ 3d ⁶,number of unpaired d-electrons = 4

Ni = Z = 28 , Electronic configuration - ( Ar ) 4s² 3d ⁸

Ni ⁺³ = Electronic configuration - ( Ar ) 4s⁰ 3d⁷,number of unpaired d-electrons = 3

cu⁺ =Z= 29 , Electronic configuration - ( Ar ) 4s⁰ 3d¹⁰,number of unpaired d-electrons = 0

Fe ⁺² contains maximum number of unpaired d-electrons.

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