Writing Formulas -criss-cross Method- | Proven |

To balance ( Al^3+ ) and ( O^2- ), you need the LCM of 3 and 2, which is 6.

Even great students make errors. Here are the top 5 pitfalls of the Criss-Cross method. writing formulas -criss-cross method-

Al³⁺ O²⁻ \ / \ / \ / \/ /\ / \ / \ / \ Al₂ O₃ To balance ( Al^3+ ) and ( O^2-

Once the numbers are moved, erase the original charge superscripts. The resulting formula is the empirical formula for the compound. writing formulas -criss-cross method-

The method uses the (the number without the + or -). Never carry the plus or minus sign down as a subscript.