AIIMS 2017 Chemistry Electronic Configuration MCQ Question
Which of the following has maximum number of unpaired d-electrons?
Fe²⁺
Cu⁺
Zn
Ni³⁺
Correct Answer
Detailed Explanation
Zn (Zinc) has the electron configuration [Ar] 3d¹⁰ 4s², resulting in no unpaired d-electrons since all d-orbitals are fully filled. In contrast, Fe²⁺ (Iron) has the configuration [Ar] 3d⁶, Cu⁺ (Copper) has [Ar] 3d¹⁰, and Ni³⁺ (Nickel) has [Ar] 3d⁷; both Fe²⁺ and Ni³⁺ have unpaired electrons (4 and 3, respectively). Therefore, Zn stands out with a maximum of 10 unpaired d-electrons, while the others have fewer due to their electron configurations.
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