Does writing chemical formulas for ionic compounds make you feel like you are trying to solve a Rubik’s Cube blindfolded? You know Sodium is ( Na ), Chlorine is ( Cl ), but how do you get ( NaCl )? And why does Calcium become ( CaCl_2 )?
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-
The Criss-Cross method is simply a visual math trick to find the lowest common multiple between those charges. Let’s break it down. You only need three things: the symbol of the metal, the symbol of the nonmetal, and their charges (oxidation states). Does writing chemical formulas for ionic compounds make