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  • Compare the general characteristics of the first series of the transition metalswith those of the second and third series metals in the respective vertical columns. Give special emphasis on the following points: oxidation states.

8.35 Compare the general characteristics of the first series of the transition metalswith those of the second and third series metals in the respective vertical columns. Give special emphasis on the following points:

(ii) oxidation states

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In each of the three transition series, the no. of oxidation state is minimum at the extremes and the highest at the middle of the row. In the first transition series, the +2 and +3 oxidation state are quite stable. Elements of first transition series metals form stable compounds of +2 and +3 oxidation state. But the stability of +2 and +3 oxidation state decreases in second and third series.
Second and third transition series metals formed complexes in which their oxidation state is high (WCl_{6},ReF_{7}) and in first transition series ([Co(NH_{3})_{6}]^{3+}, [Ti(H_{2}O)_{6}]^{3+}) are stable complexes.

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