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Question:

Which one of the following exhibits the largest number of oxidation states?

Ti(22)

Mn(25)

V(23)

Cr(24)

Solution:

Manganese has 5 unpaired electrons in 3d orbitals and 2 electrons in 4s. Mn can show 6 oxidation states from +2 (MnO) to +7 (MnO₄⁻).