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Which of the 3d series of elements exhib...

Which of the 3d series of elements exhibits the largest number of oxidation states. Why?

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Mn shows the maximum number of oxidation states. This is because of its outer electronic configuration, `3d^5 4s^2` Since there is not much energy difference between 3d and 45, it uses its 3d electrons also for bonding. So Mn shows all oxidation states from `+2` to `+7`.
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