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Why do some transition metals have multiple oxidation states?

Transition metals have multiple oxidation states because of their

sublevel.

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because of energy difference between (n1) d and ns orbitals (sub levels) and involvement of both orbital in bond formation

Explaination:

the reason is that there is a difference in energy of orbitals of an atom of transition metal, so there (n1) d orbitals and there ns orbitals both make a bond and for this purpose they lose an electron that is why both sublevels shows different oxidation state.