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Which of the 3d series of the transition...

Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why?

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Mn (Z = 25) exhibits the largest number of oxidation states because it has the maximum number of unpaired electrons. Hence, it shows oxidation states from +2 to +7 i.e. +2, +3, +4, +5, +6 and +7.
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