Step 1 : Introduction to the question "8. What do you use to work out the formula of an ion?"
...1. Balance the charges on each of the components in the compound. 2. Guess. 3. Put numbers of atoms together to see what looks good. 4. Get the formula from the internet. Balancing the charges or counting the number of electrons in the outer shells of the atoms are two ways to find out a formula of an ion. eg. Ba2+ and F1- =BaF2 You should never guess or get the information from the internet, because it is likely to be wrong.
