Naming monatomic ions and ionic compounds
Cations and anions
Predicting charges on monatomic cations and anions
Elements that form cations
Elements that form anions
Elements that form multiple types of cations
Naming monatomic anions
|Element name||Ion name||Ion formula|
Formulas and naming of basic ionic compounds
- Always name the cation before the anion; in the chemical formula, the cation will always appear first as well.
- When naming the cation within an ionic compound, we don't include the word ion or the charge unless it is a polyvalent cation. That means we only have to name the element that the ion came from (see Example 2 below).
- Any ionic compound will have a net charge of zero. Another way of saying this is that cations and anions must always combine in such a way so that their charges cancel.
- The number of cations and anions in the formula should be written as the lowest possible integer value. For example, the formula for sodium chloride is , not or some other multiple of , even though the charges would still add up to zero.
Example 1: Finding the chemical formula from the name
Example 2: Finding the name from the chemical formula
Try it: Names and formulas of ionic compounds
Naming ionic compounds with polyvalent cations
|Element||Common ions formed||Systematic name||Common (trivial) name|