A feature of transition metal chemistry is that these elements exhibit multiple oxidation states. Which one of the following elements exhibits the smallest number of different oxidation states?

Question

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Zinc (Zn) is not considered a transition metal as it does not have any partially-filled d-orbitals. It only exhibits a +2 oxidation state. The other options are all transition metals and exhibit multiple oxidation states. Ti exhibits +2, +3, and +4 oxidation states; Cr exhibits +2, +3, +6; Mn exhibits +2, +4, +7; and Co exhibits +2 and +3 oxidation states.

A Feature of Transition Metal Chemistry Is That These Elements