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Which of the following species contains the greatest number of unpaired electrons?

1. Mg2+
2. Ti3+
3. V3+
4. Fe2+

Correct answer: Fe2+

Solution

Mg2+ (0), Ti3+ 3d1 (1), V3+ 3d2 (2), Fe2+ 3d6 (4 unpaired). Fe2+ has the most unpaired electrons, so the answer is Fe2+, not V3+.

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