Question

100 compounds by criss cross method

Answer 1

TheThorpe's Crisscross methodis a method of finding out thechemical formulaof a metal and non-metal that combine to form an ionic bond created by high school chemistry teacher Kim Thorpe.[1]To use this method, the absolute value of theoxidation numberof the first ion is used as the subscript of the second, and vice versa. The subscripts are then reduced by thegreatest common factor. For instance, to find the formula foraluminium oxide:The oxidation number of Al is +3 and oxygen is -2. Crisscross the absolute values to give Al2O3To find the formula for magnesium oxide:The oxidation number of Mg is +2 and oxygen is -2. Crisscross the absolute values to give Mg2O2In this example there is a common factor of 2 so divide by 2 to give MgO.


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