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Common oxidation states of transistion elements

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ximikoudi:
In order to find the conductivity ( p or n type ) in semiconductors such as V2O5 or CuBr i have to know if the oxidation state of the element is maximum or minimum. The d block elements have multiple oxidation states. (eg: Cr from +2 up to +6). But I should be able to find the most common ones which for Cr are +2 ( minimum ) +3 ( maximum ). Is there any general rule in order to distinguish the most common oxidation states of transition elements?  :-[

billnotgatez:
I post this link to aid in the further discussion of this thread

https://en.wikipedia.org/wiki/Oxidation_state#List_of_oxidation_states_of_the_elements
List of oxidation states of the elements

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