OpenStudy (anonymous):
Can someone help with the Cris-Cross method. And the polyatomic ions.
OpenStudy (anonymous):
The crisscrosse method is the method of finding out the chemical formula of a metal and a non-metal that combine to form an ionic bond. To use this method, the absolute value of the oxidation number of the first ion is used as the subscript of the second, and vice-versa. The subscripts are then reduced by greatest common factor. For instance, to find out the formula of Aluminium oxide:- The oxidation number of Aluminium is +3 and oxygen is -2. Criss-cross the absolute value to give Al2O3... To find out the formula of Magnesium oxide:- The oxidation number of Magnesium is +2 and oxygen is -2. Criss cross the absolute value to give Mg2O2. In this example, there is a common factor of 2 so divide by 2 to give MgO....
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