KVPY 2020-21 SA Exam Previous Papers

Question : 40 of 80

Marks: +1, -0

The correct set of quantum numbers for the unpaired electron of Cu atom is:

Solution:

{Cu}(29) ; 1 {s}^{2}, 2 {s}^{2}, 2 {p}^{6}, 3 {s}^{2}, 3 {p}^{6}, 4 {s}^{1}, 3 {d}^{10}

So, for the unpaired electron of Cu that is present in

4 {s}^{1}

, set of quantum numbers is;

{n}=4, {l}=0, {m}=0, {s}=\±{1}/{2}

\∴

Correct option is (C)

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