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

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Which of the 3d-seres of the transition metals exhibits the leagest number of oxidation states ?
A. Cr
B. Mn
C. Fe
D. Co
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Mn shows the widest range of oxidation states of all the elements form `(-3)` to `(+8)`, because its electronic configuration is `3d^(5)` `4s^(2)` and hence it has maximum number of valence electrons to involved in bonding.
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