Question

could write the formula of compounds using Criss cross method​

Answer 1

Explanation:

An alternative way to writing a correct formula for an ionic compound is to use the crisscross method. In this method, the numerical value of each of the ion charges is crossed over to become the subscript of the other ion........

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Answer 2

Answer:

$\frac{a}{b } = \frac{c}{d} \\ then \frac{a}{c} = \frac{b}{d}$