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Calculate the number of unpaired electro...

Calculate the number of unpaired electrons in the following cations : `La^(3+), Ce^(4+), Lu^(3+), Yb^(2+), Gd^(3+), Tb^(4+)`

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`La^(3+), Ce^(4+), Lu^(3+), Yb^(2+)` : Bo unpaired electrons, `Gd^(3+), Tb^(4+)` : 7 unpaired electrons.
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