Essential Chemistry for IGCSE - Formulae And Equations (Section 1 - No. 30)
In the formula for an ionic compound, how can you determine the number of each element needed?
By looking at the valency of each element
By looking at the atomic mass of each element
By alphabetical order of the elements
By using only the metal in the formula
Explanation
The valency helps determining the number of each element.
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