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Copper (I) is diamagnetic while copper ...

Copper (I) is diamagnetic while copper (II) is paramagnetic . Explain.

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The configuration of copper in the two oxidation states is :
`Cu(I):[Ar]^(18)3d^(10),Cu(II):[Ar]^(18)3d^(9)`
Cu(I) has all filled orbitals and is diamagnetic in nature. On the other hand , Cu(II) has one half-filled orbital and paramagnetic in nature.
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Additional Important Question
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