- Watch the video on writing formulas for ionic compounds with transition metals.
- Review Essential Information on formula writing for ionic compounds with transition metals.
- Correctly write the formula for ten in a row!

Once you get ten in a row, return to the Syllabus or continue to Naming Ionic Compounds with Polyatomic Ions).

- Write the symbol and charge for the transition metal. The charge is the Roman Numeral in parentheses.
- Write the symbol and charge for the non-metal. If you have a polyatomic ion, use the Common Ion table to find the formula and charge.
- See if the charges are balanced (if they are you’re done!)
- Add subscripts (if necessary) so the charge for the entire compound is zero.
- Use the crisscross method to check your work.

- Don’t write the subscript '1'.
- If you use the criss-cross method and end up with something like Ca
_{2}S_{2}you'll need to reduce the subscripts to Ca_{1}S_{1}which we write CaS.