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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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Manganese (atomic no.= 25) has electronic configuration `[Ar] 3d^(5) 4s^(2)` It shows maximum number of oxidation states, i.e., from +2 to +7 (+2, +3, +4, +5, +6, +7) in its compounds.
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