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Atomic number `""_(64)Gd, ""_(66)Dy, ""_(69)Tm, ""_(71)Lu.` which of the following does not have unpaired electron ?
A. `Gd^(3+)`
B. `Dy^(3+)`
C. `Tm^(3+)`
D. `Lu^(3+)`

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Correct Answer - D
We know that, `Gd ^(3+)` has `4f^(7)` configuration containing 7 unpaired electrons. `Dy ^(3+)` has `4f ^(9)` congiguration, containing five unpaired electrons. `Tm^(3+)` has `4f ^(12)` configuration, containing two unpaired electrons. `Lu^(3+)` has `4f^(14)` configuration does not contains unpaired electrons.

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