Writing Formulas — -criss-cross Method-

So, the next time you have a quiz on ionic compounds, don’t panic. Just draw those arrows, criss-cross like you’re dancing, and watch the formula appear.

If your criss-cross gives you ( Mg_2O_2 ), you have to reduce it! Divide by the greatest common factor (2) to get ( MgO ). Never leave double ones. writing formulas -criss-cross method-

Did you cross the 2 and 3 to get ( Mg_3N_2 )? If yes, put a gold star on your notebook. You’ve mastered the method. The Criss-Cross method isn't just a hack; it is a visual representation of charge balance. It takes the guesswork out of bonding and turns formula writing into a simple, repeatable pattern. So, the next time you have a quiz