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Most of transition metals show variable ...

Most of transition metals show variable oxidation states. Explain

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The variable oxidation states of transition elements due to the availability of both (n - 1) d and ns electrons for bond formation, as the energies of Penultimate d-orbitals and ultimate s-orbitals are nearly same. The sum total of ns and unpaired (n - 1) d electrons determines the highest oxidation state shown by a transition elements.
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