The common oxidation state of elements of V A group are +3 and +5. In addition nitrogen also exist in +1,+2, and +4 oxidation states in its oxide, viz N2O,NO,N2O3,NO2 and N2O5.
However due to inert pair effect, bismuth does not exist in +5 oxidation state. Thus nitrogen exist in all oxidation state +1 to +5.