How to Write the Formula for Chromium VI oxide

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In this video we'll write the correct formula for Chromium (VI) oxide (CrO3). • To write the formula for Chromium (VI) oxide we’ll use the Periodic Table and follow some simple rules. • • --Keys for Writing Formulas for Compounds with Transition Metals-- • 1. Write the symbol and charge for the transition metal. The charge is the Roman Numeral in parentheses. • 2. 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 • Figuring out the Charge on Ions ). • 3. See if the charges are balanced (if they are you're done!) • 4. Add subscripts (if necessary) so the charge for the entire compound is zero. • 5. Use the crisscross method to check your work. • Notes: • Don't write the subscript '1'. • If you use the criss-cross method and end up with something like Ca2S2 you'll need to reduce the subscripts to Ca1S1 which we write CaS. • It is possible to have two polyatomic ions such as NH4NO3. In this case find and write both names as found on the Common Ion Table. • For a complete tutorial on naming and formula writing for compounds, like Chromium (VI) oxide and more, visit: • http://www.breslyn.org/chemistry/naming

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