Compare the stability of +2 oxidation state for the elements of the first transition series.
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From the periodic table, Mn shows the maximum number of oxidation states which varies from the +2 to the +7.
Number of the oxidation states increases while moving from the Sc to Mn.
From Mn to Zn, the oxidation states numbers decrease due to the decrease in number of the unpaired electrons (available).
Stability of +2 oxidation state increases from top to bottom as it becomes difficult to eliminate third electron from d-orbital on moving Mn to the Zn.
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