We now know the most common trioxides in Tetra oxides, but what happens when we start messing around with the number of oxygens they possess? Well, this is going to open up a whole new Ave. of other polyatomic ions. We're going to say here, decreasing the number of oxygens by one changes the ending to 8, while keeping the overall charge the same.
So up above we saw that a common tetraloxide was sulfate. It's a Tetra oxide because it has four oxygens and we knew that based on where it's located on the periodic table, its charges to minus. Now in this form its ending as eight. Now we're going to decrease the number of oxygens by just one. It becomes SO32-. The overall charge stays the same, so it's 2 minus.
Our eight ending now changes to 8 so, SO32- is solved fight so it now so that is the difference in these polyatomic ions. So just remember once we start manipulating the number of oxygens, we can create a whole new polyatomic ion and a name associated with it. Now that we've seen this example, let's move on and look at some other polyatomic.