The formula for tin II nitrate is Sn(NO3)2.
In this formula, ‘Sn’ represents tin, which has a +2 oxidation state in this compound (indicated by ‘II’). The nitrate ion (NO3–) has a -1 charge. Therefore, to balance the charges and create a neutral compound, we need two nitrate ions for each tin ion, leading to the formula Sn(NO3)2.