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  4. Which one of the following is a diamagnetic ion ?

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Q. Which one of the following is a diamagnetic ion ?

EAMCETEAMCET 2001The d-and f-Block Elements

Solution:

$Co^{2+}$ (Z = 27) : $[Ar]^{18}\, 3d^7$ (3 unpaired electrons)
$Cu^{2+} $ (Z = 29) : $[Ar]^{18} 3d^9$ (1 unpaired electrons)
$Mn^{2+}$ (Z = 25): $[Ar]^{18} \, 3d^5$ (5 unpaired electrons)
$Sc^{3+}$ (Z = 21): $[Ar]^{18} \, 3d^0$ (No unpaired electron)
$Sc^{3+}$ with no unpaired electron will be diamagnetic