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Which of the 3d-seres of the transition ...

Which of the 3d-seres of the transition metals exhibits the largest number of oxidation states ?

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`Mn(Z=25)` with electronic configuration `[A]3d^(5)4s^(2)` shows maximum oxidation state (+7) in its compounds since it has the maximum number of unpaired five i.e., seven. It shows largest variable oxidation state from +2 or +7 (+2,+3,+4,+5,+6,+7) in its compounds.
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