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Among the following species, how many have a spin-only magnetic moment of 1.73 B.M. (i.e. exactly one unpaired electron)? Fe2+, Cu2+, Ni2+, NO2, NO2-, Ti3+

1. 2
2. 3
3. 4
4. 1

Correct answer: 3

Solution

Cu2+ (d9), NO2 (odd-electron radical), and Ti3+ (d1) each have one unpaired electron, while Fe2+ (4), Ni2+ (2) and NO2- (0) do not.

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