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3.4 Writing Chemical Formulae |
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Answer» Ionic compounds are neutral compounds made of positive cations and negative anions.Writingthechemical formulafor ionic compounds is fairly easy. Write the cation symbol, then the anion symbol. Find the lowest common multiple for the ions to make the compound neutral. RULE I: Cross multiply the valencies of the elements to form the formula of the respective compound. RULE II: If a compound consists of both metallic as well non-metallic elements then name or symbol of the metal is considered first. RULE III: In case compounds are formed from polyatomic ions then the ion is enclosed in a bracket before writing the number to indicate the ratio. But in case the number of polyatomic ion is one then there is no need for bracket. |
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