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Which of the following has no unpaired `e^-` ?

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Which of the following has no unpaired `e^-` ?
A. `Gd^(+3)`
B. `Tm^(+3)`
C. `Dy^(+3)`
D. `Lu^(+3)`
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Correct Answer - D
Electronic configuration of Lu is [Xe] `4f^14 5d^1 6s^2`
Electronic configuration of `Lu^(+3)` ion is `[Xe] 4f^14 5d^0 6s^0`
Therefore it has no unpaired electron
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