Chemistry- figuring out the formula from the systematic nameWatch
Oxygen has an oxidation state of -2 unless it's in hydrogen peroxide, and there are 3 oxygen atoms, so the oxygen in the compound gives a total of -6. Na has an oxidation state of +1 as it's in group 1 of the periodic table. N has a +5 oxidation state as worked out from the name. A compound should have a sum of oxidation states of all atoms equal to 0: (-6) + 5 + 1 = 0. So you have NaNO3. It took 1 Na atom, 1 N atom and 3 O atoms to give an overall oxidation state of 0, working backwards from knowing the oxidation state of N was +5. So your molecular formula is NaNO3.