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Among the following ions, which one has a non-zero spin-only magnetic moment (i.e. is paramagnetic)?

1. Cu(2+)
2. Sc(3+)
3. Zn(2+)
4. all of these

Correct answer: Cu(2+)

Solution

Cu(2+) is d9 with one unpaired electron, giving a non-zero moment (about 1.73 BM), whereas Sc(3+) (d0) and Zn(2+) (d10) have all electrons paired/absent and zero moment.

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