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Question
Give a reason for the following:
Cu+2 salts are paramagnetic, while Cu+ salts are diamagnetic.
Solution
The electronic configurations of Cu2+ and Cu+ are [Ar] 3d9 4s0 and [Ar] 3d10 4s0, respectively. Cu2+ has one unpaired electron, making it paramagnetic, whereas Cu+ has no unpaired electrons, making it diamagnetic.
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