From the table shown above we can deduce the following points:

1. Mn shows maximum number of oxidation states, that ranges between +2 to +7.
2. The number of oxidation states increases as we move on from Sc to Mn, that is, from top to bottom till Mn shows up.
3. On moving from Mn to Zn, the number of oxidation states decreases due to a decrease in the number of available unpaired electrons.
4. The relative stability of the +2 oxidation state increases on moving from top to bottom. This is because on moving from top to bottom in a group, it becomes more and more difficult to remove the third electron from the d-orbital as it is tightly bound to the nucleus and requires a lot of energy.