Tin exhibits 2 oxidation states; Sn(NO_3)_4 and Sn(NO_3)_2 are conceivable.
Explanation:
Both "stannous nitrate", Sn(NO_3)_2, and "stannic nitrate", Sn(NO_3)_4, are known. I suppose the Sn(II) compound would be a little easier to handle, but the oxidation number must be specified for clarity.