Which of the following is/are not a characteristic(s) of the transition elements in the series from scandium to copper ? 

First row of transitions elements have one or more than one unpaired electrons, therefore they formed colored compounds. Because of having small cationic size and vacant orbital, they have ability to form complexes. 

In first row transition elements, the common oxidation states are +2 and +3, +1 only seen in chromium and copper.