6)Write the chemical formula of compounds by criss-cross method.
a)Sodium carbonate
c)Zinc hydroxide
b)Ammonium chloride
d)Calcium oxide
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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. Signs of the charges are dropped.
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