![]() ![]() Because the charges on the ions are characteristic, sometimes we have to have more than one of a cation or an anion to balance the overall positive and negative charges. The key to writing proper ionic formulas is simple: the total positive charge must balance the total negative charge. A proper ionic formula has a cation and an anion in it an ionic compound is never formed between two cations only or two anions only. This is the cobalt(II) cation.Ĭhemical formulas for ionic compounds are called ionic formulas. We note from Table 3.2 “Monatomic Ions of Various Charges” that cobalt cations can have two possible charges, so the name of the ion must specify which charge the ion has.
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