8.19 Compare the stability of +2 oxidation state for the elements of the first transition series.

According to our observation, except scandium, all other elements of the first row shows +2 oxidation state. On moving from $Sc$ to $Mn$ the number of oxidation states increases but from $Mn$ to $Zn$ number of oxidation states decreases due to a decrease in unpaired electrons. The stability of +2 oxidation state increase on moving from $Sc$ to $Zn$ due to increase in difficulty level of removal of the third electron from d -orbital.

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