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An element with which of the following outer electronic configurations can show the greatest number of oxidation states in its compounds?

1. 3d7 4s2
2. 3d8 4s2
3. 3d5 4s2
4. 3d6 4s2

Correct answer: 3d5 4s2

Solution

3d5 4s2 corresponds to Mn, which exhibits the widest range of oxidation states (+2 to +7) among 3d metals.

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