An elements $Z$ has valency of 3. What is the formula of the oxide of $Z$ ?

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Solution

We are given that the element $Z$ has a valency of 3. The oxide ion is denoted by $O^{2 -}$ and has a valency of 2. So in order to find the chemical formula of the compound, we will cross over the valencies of the two combining atoms. Thus the chemical formula of the substance will be $Z_{2} O_{3}$

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